A random sample of 230 students in STAT 200 were asked whether or not they have ever been in a pedestrian accident while using technology. Forty six of these 230 STAT 200 students answered “yes.” The results are summarized in the Minitab output found below.   Using the provided 95% confidence interval, which is the correct interpretation? When considering STAT 200 students while using technology, we are 95% confident that the:

Research Question: Is there evidence that, on the average, males miss more classes in a semester for alcohol-related reasons when compared to females? The parameter of interest is a [answer1]. To answer this question, we should [answer2].  

Researchers surveyed 50 students (group 1) sitting in the back half of the classroom and 15 students (group 2) sitting in the front half of the classroom and recorded their GPA.  The goal of the study was to see if, on average, the students that sat in the back half of the classroom have lower GPAs than those that sat in the front half. The sample statistic is -0.170 (using back minus front) with standard error 0.062.  The p-value is 0.032. Complete the statements below: Using a significance level of 0.05, the researchers should [answer1] the null hypothesis. It is possible that they have committed a type [answer2] error.

:Assume a researcher asks 125 Penn State students the following two questions   How do you typically commute to class from your home? (walk, bike, take bus, drive) Are you an only child?  (yes, no) The responses are summarized below. Yes    No    Total Walk 25 35 60 Bike 6 12 18 Take the bus 4 18 22 Drive 10 15 25 Total 45 80 125 When considering ‘Yes’ and ‘Bike’,  the correct calculation for the expected count is [answer1]. The correct interpretation of the expected count is: If the two variables are [answer2], we would expect that around [answer3] of children who [answer4] an “only child” to [answer5] when commuting from home to class.

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Fifteen students were asked how many nights a month do they study.  The responses are listed in the table found below.  Student 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Number of nights study/month 4 5 6 10 12 14 18 20 20 20 22 23 24 25 26 The mean is 16.6 nights/month Match the attribute of the sample with the appropriate answer.   

A researcher asked random samples of 50 kindergarten teachers and 50 12th grade teachers how much of their own money they spent on school supplies in the previous school year. They wanted to see if teachers at one grade level spend more than teachers at the other grade level. In this study, it turns out that 12th grade teachers generally earn more money than kindergarten teachers. In this study, the  ‘income of the teacher’ is an example of a(n): [answer1] variable.

Suppose we wish to know if females at a university are less likely to believe in extraterrestrial life than males.  The hypothesis test to answer the research question is a [answer1] test for the [answer2].

Consider testing the hypotheses below: H0: p = 0.48  Ha: p > 0.48 If the standardized test statistic is  Z = 0.75, which is the only possible “correct” p-value and picture from the standard normal distribution?

Researchers are interested in finding out if there is any association between the number of hours a student works in a week and the number of classes they miss in a week.  Assume data was collected and they found a correlation of 0.326. Using this information, they calculated a p-value of 0.194. Determine whether each of the statements below is true or false.