52. Reporting cheating What proportion of students are willing to report cheating by other students? A student project put this question to an SRS of 172 undergraduates at a large university: “You witness two students cheating on a quiz. Do you go to the professor?" The Minitab output below shows the results of a significance test and a 95% confidence interval based on the survey data.16 Session Test and Cl for One Proportion Test of p - 0.15 va p not - 0.15 Sample X N Sample p 1 951 CI Z-Value P-Value 19 172 0.110465 (0.063619, 0.157312) -1.45 0.146 (a) Define the parameter of interest. (b) Check that the conditions for performing the signifi- cance test are met in this case. (c) Interpret the P-value in context. (d) Do these data give convincing evidence that the ac- tual population proportion differs from 0.15? Justify your answer with appropriate evidence.

Repairs: A sample of six records for repairs of a component showed the following costs: 95, 87, 20, 75, 90, 96. Construct a 90% confidence interval for the mean cost of a repair for this type of component. Use tables and technology. Round your answers to at least one decimal place.

2.) A survey of 200 college students revealed that 160 of them eat dessert daily. Construct a 95% confidence interval for the population proportion of college students who eat dessert daily. Can we claim that 75% eart dessert daily?

To decide between using an independent-samples t test and a one-way ANOVA, which question should the researcher ask? a. Is the population mean known b. Is the goal to measure association or to make a prediction c. Are there more than two levels of the independent variable d. Is the research deisgn between-groups or within-groups

4 part question.

how does increasing the sample size influence the size of the t statistic in a hypothesis test. How does it influence the width of a 95% confidence level?

A psychologist wants to demonstrate the effectiveness of ACT therapy for the treatment of depression. 30 people who were seeking treatment for depression asked to complete the Beck depression inventory (BDI) before the first sessionof therapy and again after one month of therapy. Which statistical test would be best to determine if there is a significant difference between measures? One sample t-test Dependent samples t-test Independent samples t- test ANOVA

PROBLEM: A psychologist asks a random sample of 30 female adolescents and a separate, random sample of 30 male adolescents how much time they spend communicating with others online on an average day. She compares the time spent communicating online of female adolescents with that of male adolescents. In your project include: The problem and data. Calculate and interpret the correct 90% confidence interval for the mean difference in the two groups average time spent communicating online. (Use the 4 steps) Preform the correct significance test to test the claim that females spend more time than males communicating online. Use a level of significance of 0.05 and then use a level of significance of 0.10. Explain your results for each alpha. (Use the 4 steps) Answer the initial question and explain how you should use the confidence interval AND significance test to answer it. Review the rubric to make sure you include all necessary components. 1. Data: Hours…

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Construct a 95% confidence interval for p1 - p2 for a survey that finds 30% of 240 males and 41% of 200 females are opposed to the death penalty. Group of answer choices a.(-0.200, -0.021) b.(-1.532, 1.342) c.(-1.324, 1.512) d.(-0.561, 0.651)