As quality control manager at a raisin manufacturing and packaging plant, you want to ensure that all the boxes of raisins you sell are comparable, with 35 raisins in  each box. In the plant, raisins are poured into boxes until the box reaches its sale  weight. To determine whether a similar number of raisins are poured into each box, you randomly sample 25 boxes about to leave the plant and count the number of raisins in each. You find the mean number of raisins in each box to be 33.2, with s = 2.43. Perform the 4 steps of hypothesis testing to determine whether the average number of raisins per box differs from the expected average 35. Use alpha of .05 and a two-tailed test. 

A recent study indicates that simply giving college students a pedometer can result in increased walking (Jackson & Howton, 2008). Students were given pedometers for a 12-week period and asked to record the average number of steps per day during weeks 1, 6, and 12. The following data are similar to the results obtained in the study. 

a. Use a repeated-measures ANOVA with to determine whether the mean number of steps changes significantly from one week to another.

b. Compute to measure the size of the treatment effect.

c. Write a sentence demonstrating how a research report would present the results of the hypothesis test and the measure of effect size.

Which sample fairly represents the population? Check all that apply.

1) measuring the heights of every fiftieth person on the school roster to determine the average heights of the boys in the school.

2) calling every third person on the soccer team’s roster to determine how many of the team members have completed their fundraising assignment observing every person.

3) walking down Main Street at 5 p.m. one evening to determine the percentage of people who wear glasses.

4) sending a confidential e-mail survey to every one-hundredth parent in the school district to determine the overall satisfaction of the residents of the town.

5) taking a poll in the lunchroom (where all students currently have to eat lunch) to determine the number of students who want to be able to leave campus during lunch

Which sample fairly represents the population? check all that apply