Concept explainers
For Exercises 9 through 24, perform the following steps. Assume that all variables are
a. State the hypotheses and identify the claim.
b. Find the critical value.
c. Compute the test value.
d. Make the decision.
e. Summarize the results.
Use the traditional method of hypothesis testing unless otherwise specified.
18. Reading Program Summer reading programs are very popular with children. At the Citizens Library, Team Ramona read an average of 23.2 books with a standard deviation of 6.1. There were 21 members on this team. Team Beezus read an average of 26.1 books with a standard deviation of 2.3. There were 23 members on this team. Did the variances of the two teams differ? Use α = 0.05.
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ALEKS 360 BLUMAN ELE.STAT:A STEP.(11WKS)
- What is an experiment? Give two examples.arrow_forwardFor the data presented below, use SPSS to conduct a Pearson r test to determine if a significant relationship exists between the variables. If there is a significant relationship, indicate if the relationship is positive or negative. List all five steps for hypothesis testing. Student’s Grade Point Average: 3.56, 2.79, 3.01, 3.95, 4.00, 2.90, 3.35, 3.67, 3.77, 3.30, 2.75, 3.04 Number of Hours Spent Playing Video Games per Week: 12, 25, 45, 15, 20, 50, 16, 25, 40, 15, 40, 20arrow_forwardName: Perform the hypothesis testing for question 2B. Calculate Z Statistic, compare statistic to critical 5. value(s), make decision and interpret you decision. The mean of Becky's sample is 1650.arrow_forward
- Determine the first step of hypothesis testing, and explain the procedure and logic of this step. Choose the correct answer below. A. The first step is to determine the level of significance at which to conduct the hypothesis test. The conventional levels of significance used are 5% and 1%, which are described as the 0.05 significance level and the 0.01 significance level, respectively. When a sample score is so extreme that researchers reject the null hypothesis, the result is said to be statistically significant. B. The first step is to restate the question as a research hypothesis and a null hypothesis about the populations. Since researchers are interested in the results in terms of the population, it is useful to restate the research question in terms of populations. The research hypothesis represents the research question being asked. C. The first step is to determine the characteristics of the comparison distribution. The overall logic of hypothesis…arrow_forwardTV Viewing. The A. C. Nielsen Company collects data on the TV viewing habits of Americans and publishes the information in Nielsen Report on Television. Suppose that you want to use a paired sample to decide whether the mean viewing times of married men and married women differ. a. identify the variable. b. identify the two populations. c. identify the pairs. d. identify the paired-difference variable. e. determine the null and alternative hypotheses. f. classify the hypothesis test as two tailed, left tailed, or right tailed.arrow_forwardIdentify whether inferential statistics is applicable or not. Justify your answers by giving a logical explanation. An auditor of a government office wants to assess what proportion of experiment records were done correctly. Instead of going over 10,000 records, she decides to sample the first 100 records on her desk, and notices that 97 of them were done well. She concludes that 97% of all the records given to her were done well.arrow_forward
- When performing a hypothesis test upon two dependent samples, the variable of interest is Group of answer choices a.the absolute value of the differences that exist between the matched-pair data. b.the differences that exist between the matched-pair data. c.the data that is the same in both samples. d.all of the combined data.arrow_forwardUse the traditional method in testing the hypothesis in the problems below. In each problem, state the following:d. Make the decisione. Summarize the result The manager of the cosmetics section of a large department store wants to determine whether newspaper advertising really does affect sales. For her experiment, she randomly selects 15 items currently in stock and proceeds to establish a baseline. The 15 items are priced at their usual competitive values, and the quantity of each item sold for a 1-week period is recorded. Then, without changing their price, she places a large ad in the newspaper, advertising the 15 items. Again, she records the quantity sold for a 1-week period. The results follow. Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15No. of Items Sold Before Ad 25 18 3 42 16 20 23 32 60 40 27 7 13 23 16No. of Items Sold After Ad 32 24 7 40 19 25 23 35 60 43 28 11 12 32 28arrow_forwardThe null and alternative hypotheses are statements made about A. population parameters.B. sample parameters.C. sample statistics.D. either A or C.arrow_forward
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