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Hypothesis Testing

Statistics: Baseball Averages

See attached data file. Describe and perform the five-step hypothesis test process: Set up the hypothesis, Select a level of significance, Establish the decision rule, Calculate the test statistic, Draw conclusion. One Sample Hypothesis Using the Major League Baseball Data Set available through the "Data S

Statistics: The T-Formula for Independent Samples

See attached file. Please use the following numbers in the attached formula to solve the problem. All numbers are already calculated for you. Remember, Please (parentheses), Forgive (factor), My (multiplication), Dear (division), Aunt (addition), Sally (subtraction). Please complete the following using the 5 steps of hypo

Statistics: Variance in Medicare spending

Medicare spending per patient in different U.S. metropolitan areas may differ. Based on the sample data below, is the average spending in the northern region significantly less than the average spending in the southern region at the 1 percent level? (a) State the hypotheses and decision rule. (b) Find the test statistic a

Relationship Between Gender and Amount of Alcohol Consumed

Michelle is a counselor at the local crises center. She wishes to determine if there is a relationship between the gender of an individual and the amount of alcohol consumed. She took a random sample of 68 files to test her assumption. At the .05 significance level, can she conclude that alcohol consumption is related to gender?

CJ's Discount Appliance problem

CJ's Discount Appliance Store issues its own credit cards. The credit manager wants to know if the mean monthly, unpaid balance is more than $400. The level of significance is .05. A random check of 200 unpaid balances revealed the sample mean of $420 and the standard deviation of the sample is $40. Should the credit manager

One Sample Hypothesis Testing: Salary of American League v N

See attached baseball 2007 data. 1. Learning Team Assignment: One Sample Hypothesis Testing Paper · Use the ratio or interval numerical data from one of the data sets available through the Data Sets link on your student Web site. · Develop one research question from which you will formulate a r

Koi's Yummy Burgers delivery times

Koi's Yummy Burgers claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the .05 significance level, can we conclude that 90% of the orders are delivered in less than 10 minutes? 43. What test is mos

Reasonable to conclude that an ER visit is related to ability to pay?

Hiren is the accounts receivable manager of an local hopital. The hospital is concerned that people are using ER services have sufficient resources to cover their visit. According to research, Hiren has found that indigent patients use the ER as a facility of convenience and not for true emergencies He reviewed a ra

Statistics: Average weight and height of boys and girls at age 9

At age 9, the average weight (21.3 kg) and the average height (125.5 cm) for both boys and girls are the same. A random sample of both boys and girls yielded these results. Do your results support this claim? ( Boys Girls mean 22.6 20.4 variance 20 19 n 60 50 Adapted from Bluman, 2004, p.

Is data sufficient to test better memory scores with new herbal supplement?

A researcher is testing the effectiveness of a new herbal supplement that claims to improve memory performance. A sample of n = 25 college students is obtained and each student takes the supplement daily for six week. At the end of the 6-week period, each student is given a standardized memory test, and the average score for the

What is the effect of the significance level (alpha) on the likelihood of 1) rejecting the null hypothesis, and 2) committing a type I error or a type II error? Why does the significance level differ among industries?

Is the null hypothesis more likely to be rejected at alpha = 0.01 than alpha = 0.10? As the significance level increases to alpha = 0.10 from alpha = 0.01, which type of error (type I error or type II error) is more likely to occur? What may be done to reduce the likelihood of incurring this error? Why does the significance lev

AVX Stereo Equipment Survey

AVX Stereo Equipment, Inc recently began a "no hassles" return policy. A sample of 500 customers who had recently returned items showed 400 thought the policy was fair, 32 thought it took too long to complete the transaction, and the rest had no opinion. On the basis of this information, make an inference about customer reaction

Statistics - Null Hypothesis,Test Statistic, P-Value, Decision

In an evaluation of the medical lab, the manager is interested in the efficiency of three technicians when they process four routine blood tests. The following data measures in minutes the amount of time it takes each technician to provide each of the procedures. At the .05 significance level, is there a significant difference i

Relationship Between Demographic and Congestive Heart Failure

A clinical investigator is interested in understanding the relationship between demographic factors and congestive heart failure, measured by a cardiac index (CI). A random sample of 12 patient charts of CHF patients revealed the data below. Using the five-step hypothesis test at the .05 level, determine what demographic factors

Statistics

The average monthly gasoline (gallon) purchase for a family with 2 cars is 62 gallons.This statistic has a normal distribution with a standard deviation = 6 gallons. A family is chosen at random. a)Find the probability that the family's monthly gasoline (gallon) purchases will be between 47 and 67 gallons. _________________

Calculate the new value for scores from the original population.

A population of scores with µ = 73 and sigma = 6 is standardized to create a new population with µ = 50 and sigma = 10. What is the new value for each of the following scores from the original population? Scores: 67, 70, 79, 82. X = 67 --> z =_____ --> X =_____ X = 70 --> z =_____ --> X =_____ X = 79 --> z =

Statistics: Ordering from Lowest to Highest Score

On a psychology exam with µ = 76 and σ = 12, Tom scored 8 points below the mean, Mary had a score of X = 73, and Bill had a z-score of z = -0.50. Place these three students in order from lowest to highest score. 1 ---circle/select one ( Bill Mary Tom ) - student with lowest score 2 ---circle/select one ( Tom Mary Bil

Confidence Interval & Hypothesis Testing of Proportion

Drinking Habits: A Readers Digest Gallup Survey on drinking habits..... Christmas Presents: The Arizona Republic conducted a telephone poll........ Families in Poverty: In 2000, 8.6% of all U.S. families had income below the poverty level........... See the attached file.

Statistics Quiz

University of Phoenix RES 342 - Research and Evaluation II Quiz 2 Date: Name: /

Statistics - Solve using Five-step Hypothesis

A recent study by the Department of Transportation reported that 40% of major traffic accident this year had alcohol as a contributing factor. Hill Insurance decided to investigate their insurance claims to see if they were significantly different than the DoT's figures. A sample of 200 insurance claims for major accidents

Statistics Hypothesis Test Outputs

JoLynn Miller is a physical therapist at the local senior center. She has been testing a new procedure to improve leg strength that requires the patient to use weights to do repetitions using a new apparatus. JoLynn decides to test the effectiveness of the apparatus on two patients with similar mobility restrict

Statistics: Two -Sample Tests of Hypothesis

Exercise 27: A recent study focused on the number of times men and women who live alone buy take-out in a month. The information is summarized below Statistic Men Women Sample Mean 24.51 22.69 Population Standard Deviation 4.48 3.86 Sample Size 35 40 At the .01 significance level, is there a difference in the mean num

Hypothesis testing of Population proportion:Five step method

Hypothesis test for a population proportion A recent study at a local college claimed that the proportion, P , of students who commute more than fifteen miles to school is no more than . If a random sample of students at this college is selected, and it is found that commute more than fifteen miles to school, can we reject

Hypothesis test exercise

A postal researcher wanted to test the theory that a higher response rate is achieved when a postal questionnaire is sent out with a personalized covering letter (A) than when the covering letter is impersonal (B). Two random samples of 100 people were selected. When the questionnaires were dispatched, the first sample-receive

Predicted Value of Standardized Test Statistics

1. Given the equation of a regression line is y=-2.5x-7.6, what is the best predicted value for y given x=4.1? Assume that the variables x and y have a significant correlation. A. -2.65 B. 17.85 C. -17.85 D. 2.65 2. You wish to test the claim that the mean>23 at a level of significance of alpha=0.05 and are given sample

Finding Standardized Test Statistics in Samples

1. Suppose you want to test the claim that the mean does not equal 3.5. Given a sample size of n = 31 and a level of significance of when should you reject H0 ? a. Reject H0 if the standardized test statistic is greater than 2.33 or less than -2.33 b. Reject H0 if the standardized test statistic is greater than 1.645 or les