Rugby sevens is rapidly growing in popularity and will be included in the 2016 Olympics. Matches are played on a full rugby field and consist of two seven-minute halves. Each team also consists of seven players. To better understand the demands of women's rugby sevens, a group of researchers compared the physical qualities of elite players from the Canadian National team with a university squad. The following table summarizes some of these qualities:

Elite (n= 16)University (n= 13)QualityxsxsSprint speed (km/hr)27.30.726.01.5Peak heart rate (bpm)192.06.0193.06.0Intermittent recovery test (m)1160191781129

Carry out the significance test of a difference in sprint speed using alpha = 5%. Report the test statistic with the degrees of freedom and the p-value.

Group of answer choices

t = 2.88; df =12; p-value = 0.014; Reject.

t = 1.46; df =27; p-value = 0.1699; Do not reject.

t = 3.14; df =12; p-value = 0.0085; Reject.

t = 2.53; df =27; p-value = 0.0264; Do not reject.

Flag question: Question 27

Question 27

1pts

27.The results in the previous exercise were based on two national surveys with a very large number of individuals. Here is a study that also looked at beverage consumption, but the sample sizes were much smaller. One part of this study compared 20 children who were 7 to 10 years old with 5 children who were 11 to 13.The younger children consumed an average of 8.2 oz of sweetened drinks per day, while the older ones averaged 14.5 oz. The standard deviations were 10.7 oz and 8.2 oz, respectively. Using the pooled estimator for standard error give a 95% confidence interval for the difference in means.

Group of answer choices

(-3.1585, 18.8415)

(-4.3628, 16.9628)

(-5.4819, 18.8415)

Flag question: Question 28

Question 28

1pts

28.TheStudent Monitorsurveys 1200 undergraduates from 100 colleges semiannually to understand trends among college students.Recently, theStudent Monitorreported that the average amount of time spent per week on the Internet was 19.0 hours. You suspect that this amount is far too small for your campus and plan a survey. You feel that a reasonable estimate of the standard deviation is 10.0 hours. What sample size is needed so that the expected margin of error of your estimate is not larger than one hour for 95% confidence?