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# Hypothesis Testing

### Explanatory and Response Variables

A fast food chain sells its burgers alone or as part of a "value meal" which includes fries and a drink. They know some customers are health conscious. They want to do an experiment to see if the proportion of customers choosing the meal would increase if they offered baby carrots with the meal as an alternative to the fries. Th

### Applications of Hypothesis Testing : Develop three hypotheses that can be tested using t-tests.

Drawing on one of your interests in the study of criminal justice, develop three hypotheses that can be tested using t-tests. Why do you think it would be interesting or important to test these hypotheses? Specify the level of measurement for your independent and dependent variables.

### Are flight delays more common in the U.S.?

ANOVA: Hypothesis Tests and the ANOVA Table For the time being, the air traffic control system in the United States is run by the federal government. Some people would like to change this, arguing that the air traffic control system should be part of the private sector. Among the arguments given for the privatization of a

### ANOVA: Degrees of freedom and the F statistic

ANOVA: Degrees of freedom and the F statistic For the time being, the air traffic control system in the United States is run by the federal government. Several groups disagree with this and would like to privatize the air traffic control system. Among the arguments given for privatization is that flight delays are much too comm

### Daily Expenses for Nexus Media

Can you help me with this word problem and show step by step outline? Ms. Moline is the budget director for Nexus Media. She is comparing travel costs for sales and the audit staff. She collected the following sample data: Sales 131 135 146 165 136 142 Audit 130 102 129 143 149 120 139 At the .10 level o

### Rejecting a Null Hypothesis

A presidential candidate's aide estimates that, among all college students, the proportion who intend to vote in the upcoming election is 75% at most. If 195 out of a 255 random sample of college students expressed an intent to vote, can the aide's estimate be rejected at the 0.1 level of significance? Please see attached fi

### Hypothesis Testing and 99% Confidence Intervals

Please help answer the following questions. Provide your answers in Excel. 14. In a 2-tail hypothesis test on a population mean, what is the p-value or OSL of the hypothesis test if the calculated test statistic based on 11 observations is 3.169 and the pop. variance is unknown? 15. How large of a sample would be required

### Five Step Hypothesis - Grades

See the following grades: Males 36,12,10,8,9,12,18,14,20 Females 2,5,16,13,19,45,17 Please prepare a problem using this, and use the 5 step hypothesis testing procedure. Use z or t tests and determine standard deviation for each set of data. Please explain exactly in words what you did to get this.

### Step by step method for testing the hypothesis (independent sample t test) under 5 step approach is discussed here.

A sample of scores on an examination given to both genders in Math is Males- 72, 69, 98, 66, 85, 76, 79, 80, 77 Females-81, 67, 90, 78, 81, 80, 80, 76 At the .01 level of significance is the mean grade of the female students higher than that of males?

### Customers were waiting in line too long so data was collected. The mean time was 28 minutes. One month later a sample of 127 customers was selected. The mean wait time recorded was 26.9 minutes and the S.D. of the sampling was 8 minutes. Using the .02 level of significance, conduct a 5 step hypothesis testing to determine if the new processes significantly reduced the wait time.

Customers were waiting in line too long so data was collected. The mean time was 28 minutes. One month later a sample of 127 customers was selected. The mean wait time recorded was 26.9 minutes and the S.D. of the sampling was 8 minutes. Using the .02 level of significance, conduct a 5 step hypothesis testing to determine if th

### A sample of 40 house holds with children from Middleton was randomly selected. The mean length of time was 7.6 years, with a S.D.of 2.3 years. 55 households revealed the mean length of time was 8.1 years with S.D. 2.9 years. At .05 level of sig. can we conclude that students stayed in their district less Brockton students? Use the 5 step Hypothesis.

A sample of 40 house holds with children from Middleton was randomly selected. The mean length of time was 7.6 years, with a S.D.of 2.3 years. 55 households revealed the mean length of time was 8.1 years with S.D. 2.9 years. At .05 level of sig. can we conclude that students stayed in their district less Brockton students? Use

### Mean and Standard Deviation of Allowance in Tennessee

A nine year old gets 3.65 for allowance. Sample of 45 9 year olds in Tennessee revealed mean allowance 3.69 with a standard dev. of .24 . At .05 significance is there a difference mean allowance in Alabama for 9 year olds.

### Five Step Hypothesis Testing

A salesman makes 40 calls per week. People complained because they said that estimate was to low. In a random sample of 28 people, the standard deviation was computed to be 2.1 calls at the the significant level .05. Can one conclude that more than 40 calls were made on average?

### In the following exercises examine the given statement, and then express the null hypothesis H&#959; and alternative hypothesis H1 in symbolic form.

Having trouble figuring out how to work some problems from Elementary Statistics. See attachment for problems. In the following exercises examine the given statement, and then express the null hypothesis H&#959; and alternative hypothesis H1 in symbolic form. 12 The mean top of knee height of a sitting male is 20.7 inche

### A perfectly competitive firm is a price taker. That is, no matter how much the firm produces, it can always sell its product at the current price.

Dear OTA, Please help me with the attached questions. Thanks 1. A perfectly competitive firm is a price taker. That is, no matter how much the firm produces, it can always sell its product at the current price. In other words, a perfectly competitive firm has no control over price; it simply treats the price of its out

### Estimating the P-Value of a Sample

Experience raising New Jersey red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution. In an effort to increase their weight, a special additive is added to the chicken feed. The subsequent weights of a sample of five-month old chickens were (in pounds):

### Hypothesis testing for a given claim

Testing Hypothesis. Test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise.

### Identify the null hypothesis and testing significance

Test the given claim. Identify the null hypothesis, alternative hypothesis, and test statistic, P-value or critical value(s). Provide a conclusion about the null hypothesis, and a final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise. Travel Through the Internet

### Hypothesis Tests of Equal Variances

Test the given claim. Use a significance level of a = 0.05 and assume that all populations are normally distributed. 11. Hypothesis Test for Magnet Treatment of Pain. Researchers conducted a study to determine whether magnets are effective in treating back pain, with results given below (based on data from "bipolar Permane

### Test the claim

You are given the following data. Test the claim that there is a difference in the means of the two groups. Use alpha = 0.10. Group A Group B

### Is there sufficient evidence to conclude that a significant amount of improvement took place?

The number of sit-ups that a person can do in one minute, both before and after a physical fitness course was recorded. The data is shown below for 10 randomly selected participants. Is there sufficient evidence to conclude that a significant amount of improvement took place? Assume variable is normally distributed. Test using a

### A researcher wishes to compare two different groups of students with respect to their mean time to complete a particular task.

A researcher wishes to compare two different groups of students with respect to their mean time to complete a particular task. The time required is determined for each group. The data summary is given below. Test the claim at a= 0.05, that there is no difference in variance. Give the critical region, test statistic value, and co

### Hypothesis testing and sample size

Please see attached. A sample of size n = 14 is selected from a normal population to construct a 95% confidence interval estimate for a population mean. The interval was computed to be (7.82 to 9.64). Determine the sample standard deviation. (4 pts) Determine the p-value for each of the following hypothesis-testing situat

### Normal Distributions, Central Limit Theorem and Age Distribution

Questions: Work each question, using Excel where appropriate. Remember, each gestation period is its own normal distribution. Thus, you will need to change the "mean" and "standard deviation" to reflect the question you are answering. 2. What percent of the babies born with each gestation period have a low birth w

### Finding the Effectiveness of Teaching Methods

Six groups of randomly selected students matched for IQ and age were formed. Each student was taught a concept of time by using one of three methods: Lecture, demonstration, or teaching machine. The scores are shown in the table below indicated the student's performance when they were tested on how well the grasped the concept.

### School Committee members of a midsized New England city

Exe_1Wk1.xls The School Committee members of a midsized New England city agreed that a strict discipline code has caused an increase in the number of student suspensions. The number of suspensions for September 1992 - February 1993 for a sample of the schools is provided below. {Data} The average num

### The mean top of knee height of a sitting male is 20.7 inches.

Identifying Examine the given statement, then express the null hypothesis and alternative hypothesis in symbolic form. Be sure to use the correct symbol ( ) for the indicated parameter. 12. The mean top of knee height of a sitting male is 20.7 inches. 15. Plain M&M candies have a mean weight that is at least 0.8

### Two-Sample Hypothesis Test

Instructions..I need to do a Two or More Sample Hypothesis Test. See attached documents and then... a. In 200 - 300 words, do the following... b. Perform the five-step hypothesis test on data pertaining to your selection. The subject is in baseball "there is no correlation between salaries and wins." c. Describe t

### Comparing the mean size

Suppose that you want to compare the mean size of health care claims submitted by five groups of policyholders. Ten claims are randomly selected from amongst the existing claims for each of the five groups. The data is shown in the following table: Group 1 (\$) Group 2 (\$) Group 3 (\$) Group 4 (\$) Group 5 (\$) 763 1,3

### Statistical Strategy and Quantitative Perspectives

I have been asked to suppose that faculty at my college are assigned overload courses hence additional compensation beyond the required contract hours based on seniority. There is a concern that new faculty may not be able to enjoy the same financial compensation as their senior faculty counterparts. How would you, from a quanti