Questions from Business Statistics

Q: Now let consider only the maids who were informed. Here is

Now let consider only the maids who were informed. Here is a display of their body mass index (BMI), a measure of body fat, at the start (BMI) and at the end (BMI2) of the study. Which of these is the...

Q: The researcher was concerned about whether each maid BMI changed over the

The researcher was concerned about whether each maid BMI changed over the four-week study. Here are the results of a test performed using technology: Mean of Paired Differences=0.2068t-Statistic=3.853...

Q: What conclusion can you draw from the test in Exercise 10?

What conclusion can you draw from the test in Exercise 10? 1. The maids lost weight, on average. 2. The mean BMI for the informed maids changed during the study. 3. The mean difference in BMI was not...

Q: But maybe the BMIs of all the participants changed during the four

But maybe the BMIs of all the participants changed during the four-week period. We can calculate the change in BMI for each participant in the study, and then compare the mean change for the 41 maids...

Q: For each of the following descriptions, select the letter of the

For each of the following descriptions, select the letter of the inference method you would use. (It is possible for a method to be used more than once or not at all.) 1. Student t for a mean 2. one-p...

Q: Here are summary statistics on X hits for each of the 64

Here are summary statistics on X hits for each of the 64 female archers in the 2008 Olympics: 1. Construct a confidence interval for the proportion of arrows that hit the X circle. Write out your calc...

Q: In the final round of competition, archers shoot only 12 arrows

In the final round of competition, archers shoot only 12 arrows. Is it likely that an Olympic archer may make no X shots at all? Explain your reasoning. For seeding purposes (that is, to set up the fi...

Q: Although Zhang Juanjuan won the gold medal in 2008, she did

Although Zhang Juanjuan won the gold medal in 2008, she did not perform extraordinarily well in the seeding round. How consistent are archers? The seeding round for the women is reported in two halves...