A researcher wants to compare the hand-eye coordination of men and women and determine if there is a difference in the mean time needed to complete a task. She finds a sample of 50 men and sample of 50 women for this study. Each person is asked to thread a needle where the time needed to complete this task is recorded in seconds. What is the correct alternative hypothesis for this hypothesis test?  

In a survey, students are asked how many hours they study in a typical week. A five-number summary of the responses is included.    Min Q1 Med Q3 Max 5 9 14 20 50   Use the information from this five-number summary to identify the quantities listed below.

Research Question: A certain species of prairie flower is reported to receive on average 12 different species of pollinators per hour. A researcher thinks the average is actually higher.  A randomization distribution (based on 100 samples) has been created assuming the null hypothesis is true. To test this claim, the researcher finds 30 different plants of this species to observe and sets up cameras for each plant. After reviewing all of the footage captured over 1 hour, the reported sample average number of species to visit the prairie flowers is 13.8 The sample mean [answer1] provide convincing evidence that the average number of pollinators to visit is greater than 12 because the p-value of [answer3] is [answer2] than 0.05.

Suppose that for a random sample of 400 students a 90% confidence interval for the proportion of first-year students at a school who played in intramural sports is 35% plus or minus 5%. The level of confidence is [answer1].  The margin of error is [answer2].

A functional dexterity test was given to children of different ages where the time needed to complete the test was recorded in seconds when using the non-dominant hand.  The test involved turning over 16 pegs as fast as possible when following a certain sequence.  The data was used to obtain the Minitab output found below. Classify each statement below as true or false.

In a survey of 1000 adults, respondents were asked whether they currently had a child in college or not (college status), and whether they thought the loan obligation for most college students was too high, about right, or too little. College Status Too High About Right Too Little Total Child in College 350  80   10  440 No Child in College 250 200 110  560 Total 600 280 120 1000 Among those adults with a child in college, what percent think the loan obligation is about right?

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.