Explore BrainMass
Share

# Hypothesis Testing

### Null Hypothesis and Alternate Hypothesis; Critical Value

What is the difference between a null hypothesis and an alternate hypothesis? Explain what is meant by the critical value of a statistical value. The null hypothesis states that a difference, effect or relationship exists in a research situation? ______True _____False The confidence level expresses the degree of cert

### Statistics: Given H0, what is Ha?

See attached file for clarity. Stats questions, Fill in the blanks Q20-26. 20. Given H0: &#956;= &#956;0, then Ha : ___________________________________ . 21. Given H0: &#956; &#8804; &#956;0, then Ha : ___________________________________ . 22. Given H0: &#956; &#8805; &#956;0, then Ha : ____________________________

### Mark the terms that only relate to selecting a specific test

Place an 'X' in front of those issues that only relate to selecting a specific statistical test. (Do not put an 'X' in front of items common to all tests or not applying to statistical tests.) _____ The distribution (shape) of the population (e.g., normal, skewed, flat, etc.) _____ The measurement scale/nature of the data be

### Statistics Hypothesis test for mean time, standard deviation, type II error

Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The mean shopping time, µ spent by customers at the supermarkets has been reported to be 35 minutes, but executives hire a statistical consultant and ask her to determine whether it can be concluded

### Statistics: Five-step hypothesis test on data for manufacturing sector wage

The Data Sheet file is attached. Develop one research question to formulate a research hypothesis. Formulate both a numerical and verbal hypothesis statement regarding your research issue. Perform the five-step hypothesis test on data pertaining to your selection. Include your raw data tables and the results of the com

### Multiple regression: State the conclusion of the test

Please answer 12.7(e) e. State the conclusion of the test in part (d). Review of the previous exercise and answers: 12.1 A manufacturer of industrial chemicals investigates the effects on its sales of promotion activities (primarily direct contact and trade show), direct development expenditures, and short-range research e

### Decision of Uncertainity: Bottling plant filling process

See attached file with data set. Decision of Uncertainty PLEASE SHOW ALL WORK You are the quality manager for a bottling plant. If the filling process is working as intended, cans stamped with 12 oz. will be filled with just over 12 oz. of liquid. On average, the plant owners want 12.25 oz. in each can.

### Determine the correct decision, probability value, critical value for problems

You will be asked to determine the correct decision (Reject Ho or Fail to Reject Ho) for each of the following tests of hypotheses. 1. A hypothesis test at the 0.05 level of significance with a p-value for the sample of 0.105. 2. A hypothesis test at the 0.025 level of significance with a p-value for the sample of 0.002.

### Compare three different treatments using an analysis of variance

See attached file for clarity. 12. The following data were obtained in a study using three separate samples to compare three different treatments. a. Use an analysis of variance with ? = .05 to determine whether there are significant difference among the treatments. b. Compute the value for ?2 for these data.

### Type I and Type II errors at an automobile manufacturing plant

Type I and Type II errors Managers at an automobile manufacturing plant would like to examine the mean completion time, mu, of an assembly line operation. The past data indicate that the mean completion time is 43 minutes, but the managers have reason to believe that this value has decreased. The managers plan to perform a s

### Null and alternative hypotheses

1) The EPA fuel economy rating says that the Toyota Prius hybrid car gets 48 mpg on the highway. Deborah wonders whether the actual long-term average highway mileage of her new Prius is less than 48 mpg. She keeps careful records of gas milegae for 3000 miles of highway driving. Her result is x&#772; = 47.2 mpg. What are her

### Hypothesis Testing for Studies: Example Problems

As part of a study of corporate employees, the director of human resources for PNC, wants to compare the distance traveled to work by employees at its office in downtown Cincinnati with the distance for those in downtown Pittsburgh. A sample of 35 Cincinnati employees showed they travel a mean of 370 miles per month. A sample of

### Statistics: 17 problems

The t distribution is a continuous distribution (Points : 6) True False 2. A confidence interval for a population mean (Points : 6) estimates the population range estimates a likely interval for a population mean estimates a likelihood or probability estimates the

### Hypothesis testing compared to our legal system

How is hypothesis testing compared to our legal system, and do you agree?

### Ordinal and interval level variables

The primary difference between an ordinal level and inteval level variable is: A. an ordinal level variable has a meaningful zero point while the inteval level variable has no zero point B. an interval level variable has an assumed equal distance between values while an ordinal level only displays an odered list C. an inter

### Degrees of freedom, mean square, point estimate

Part 1 1. Use the ANOVA table SV----SS-----DF----MS----F Between 64---------------8 Within-------------2------ Total 100----------------- SSB = 64, SST = 100, MSW = 2, F = 8 a. The number of degrees of freedom corresponding to between treatments is? b. The number of degrees of freedom corresponding to within treatments i

### Statistics: Mean waiting time; average tips; e ticket complaints;

Chapter 10 Questions The MacBurger restaurant chain claims that the mean waiting time of customers is 3 minutes with a population standard deviation of 1 minute. The quality assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 significance

### Parametric and Nonparametric Data Identification

Parametric and Nonparametric Data Identification Please provide explanations for the answers. Label each of the following situations "P" if it is an example of parametric data or "NP" if it is an example of nonparametric data. 1. A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-between-fail

### Calculating Test Statistic and P-Value

5 Steps of Hypothesis testing, test that there is no difference between each set. Level of significance is .05 What type of error could be made? A 15000 16000 14000 13000 14000 13000 15000 14000 13000 14000 13000 B 15000 13000 17000 15000 14000 19000 14000 16000 19000 The answer needs t

### Five Statistics Problems: Contributions, SAT Math scores, oil output in US, domestic

See attached file for clarity. 1. According to Giving and Volunteering in the United States, 2001 Edition, the mean charitable contribution per household in the United States in 2000 was \$1623. A researcher claims that the level of giving has changed since then. State the null and alternative hypotheses using correct symbol

### Four Statistics problems: body mass index; AP opinion polls; P value where P = 0.03

1) A student reads that a 95% confidence interval for the mean body mass index (BMI) of young American women is 26.8 ± 0.6. Asked to explain the meaning of this interval, the student says, "95% of all young women have BMI between 26.3 and 27.4." Is this explanation correct? Explain your answer. 2) You ask another student to

### Taste Test for bottled v tap water, Null/Alternative Hypothesis

I conducted a blind taste test with 50 subjects (30 women, 20 men) to see if they could tell the difference between bottled and tap water. The 32 people identified what they drank correctly and 18 incorrectly. Of the 32, 20 were women and 12 were men. Of the 18, 10 were men and 8 were women. This test was conducted in one d

### Strategy for statistically testing a new diabetics drug

Let's say I have a new drug that I think helps diabetics. So I perform clinical trials in accordance with the FDA requirements. I give one randomly selected groups of diabetics the drug, and another sample gets a placebo pill. The diabetics who get the pill improve, the controls do not. I perform a t test on the data. Wh

### What is the null hypothesis for the study?

A college class believes that the average grade average of psychology students and the average grade averages of biology students are different. The class found that the actual grade averages of a sample of 11 psychology students was 3.5 and the average grade average of a sample of 14 biology students was 3.3. What is the null h

### Normal Distribution

4. Explain why t distribution tends to be flatter and more spread than the normal distribution. 12. Last fall, a sample of n = 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of t

### Personality Assessment Instrument: obsessive-compulsive disorder

Select one psychological personality assessment instrument or inventory to serve as the basis of this assignment. Explore the psychological literature to find three to five articles that test the use of this inventory or assessment on obsessive-compulsive disorder. Include the following information: o Describe the

Let Z be a standard normal random variable. Use the calculator provided to determine the value of c such that P (c <= Z <= -0.68) = -0.2064 Carry your intermediate computations to at least four decimal places. Round your answer to at least two decimal places. See attached file.

### Statistics: 4 problems

4. Explain why t distribution tends to be flatter and more spread than the normal distribution. 12. Last fall, a sample of n = 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of th

### Degree of Freedom Information

Degree of freedom, X^2 and F-tests Q1: What the degree of freedom tells us? Q2: What are the degree of freedom for t- test, X^2-test, and for F-test?

### Ideas for a hypothesis test example

Describe a problem (real or fictitious) for which it will be appropriate to utilize a hypothesis test. Describe how data will be collected, sample size, assumptions, level of measurement etc.