Question 4 According to a University Center for Logistics Management, \( 9 \% \) of all merchandise sold in the United States gets returned. A Seattle department store sampled 85 items sold in January and found that 5 of the items were returned. If you have the following null and alternative hypotheses for a test you are running: \( H_{0}: p=0.09 \) \( H_{a}: p>0.09 \) Calculate the test statistic, rounded to 3 decimal places \( z=\square \)

For an experiment comparing more than two treatment conditions or more than two groups, you should use analysis of variance (ANOVA), rather than separate \( t \) tests. True False

24. What is the \( y \)-intercept of the trend line equation, and what does it mean in the context of the situation?

Find the standard deviation of \( x \), given that \( \Sigma 4 x^{2}=14600, \Sigma 2 x=420 \) and \( n=20 \).

Which of the following is/are part of descriptive statistics? central tendency. variability. linear regression. correlation. all of the above.

5 The distribution of resting pulse rates of a sample of 2000 20-year-old men is approximately normal, with a mean of 66 beats/minute and a standard deviation of 4 beats/minute. a What percentage of these men have pulse rates of: i higher than 66 ? ii between 66 and 70 ? iii between 62 and 74 ? b Approximately how many of this sample of 2000 men have pulse rates between 54 and 78 beats/minute?