Comparing Samples

What inference can you draw by comparing the interquartile ranges?

• There is more variability in the number of days that Team A members trained because the IQR for Team A is greater than the IQR for Team B.

• There is more variability in the number of days that Team B members trained because the IQR for Team B is greater than the IQR for Team A.

• Team A members generally trained for more days than Team B members

• Team B members generally trained for more days than Team A members

The dot plots show how long it took students in Mr. Chauncey's two science classes to finish their science homework last night. Find the means to make an inference about the data.

• The 1st period mean is 35. The 2nd period mean is 38.75. On average, it took students in the 1st period class slightly longer to finish their homework than it did the students in the 2nd period class.

• The 1st period mean is 38.75. The 2nd period mean is 35. On average, it took students in the 1st period class slightly longer to finish their homework than it did the students in the 2nd period class.

• The 1st period mean is 35. The 2nd period mean is 38.75. On average, it took students in the 2nd period class slightly longer to finish their homework than it did the students in the 1st period class.

• The 1st period mean is 38.75. The 2nd period mean is 35. On average, it took students in the 2nd period class slightly longer to finish their homework than it did the students in the 1st period class.

Write the null and alternative hypothesis.

For a t-test run at a 5% significance level, select the correct conclusion.

• Reject Ho, there is a significant difference

• Fail to reject Ho, there is NOT a significant difference

• Reject Ho, there is NOT a significant difference

• Accept Ho, there is a significant difference

Q1. How many red shirts do you have?

• A) 5 red shirts

• B) 17 red shirts

• C) 40 red shirts

• D) 83 red shirts

Litzy collects data from a random sample of 7th graders. Out of 40 respondents, 7 attend afterschool programs. Of the 200 7th graders attending Litzy's school, how many would be expected to attend afterschool programs?

• 14 7th graders

• 28 7th graders

• 35 7th graders

• 42 7th graders

The dot plot shows a random sample of the number of fish caught and released by 30 participants during a two-day fishing tournament. Select the inference that can be made based on the data collected.

• On average, most participants caught and released 5 or more fish.

• More participants caught 6 fish than any other number.

• The same participants who caught and released 1 fish the first day caught and released 1 fish on the second day.

• On average, participants caught and released more fish on Day 2.

• The median for the fruit data is 100. The median for the vegetable data is 50. Fruits have a higher number for calories with greater variation.

• The median for the fruit data is 50. The median for the vegetable data is 100. Fruits have a higher number of calories with greater variation.

• The median for the fruit data is 100. The median for the vegetable data is 50. Vegetables have a higher number of Calories with a greater variation.

• The median for the fruit data is 100. The median for the vegetable data is 50. Fruits have a higher number for calories with less variation.

Which of the following statements is true?

• Group 1 has a greater median number of hours that they watched television. Group 1 has a smaller IQR, so the data is less spread out.

• The mean for group 2 is larger than the mean for group 1.

• The median for group 2 is larger than the median for group 1.

• Both sets of data are symmetric. You should use the mean to compare the measures of center.