1) the mean and standard deviation of the sampling distribution of, = 30, = 6, n = 20.

Group of answer choices

= 30,= 1.34

= 25, = 1.58

= 2.5, = 0.5

= 7.91, = 1.58

2) Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has maintained careful records regarding the time to prepare a return. The mean time to prepare a return is 90 minutes and the standard deviation of this distribution is 14 minutes. Suppose 100 returns from this year are selected and analyzed regarding the preparation time. What is the probability that the mean time for the sample of 100 returns for this year is greater than 92?

Group of answer choices

Approximately zero

0.0832

0.4168

0.0766

5) For a population that is not normally distributed, the distribution of the sample means will ________.

Group of answer choices

Be negatively skewed no matter the size of the samples

Approach a normal distribution as sample size increase

Be positively skewed as sample size increases

Take the same shape as the population for small sample sizes

6) A marketing firm is studying consumer preferences for winter fashions in four different months. From a population of women 18-21 years of age, a random sample of 300 women was selected in January. Another random sample of 300 women was selected in March. Another random sample of 300 women was selected in June. What is the number of samples?

Group of answer choices

3

300

900

No matter how many samples are taken, if those are taken from the same population there is only 1 sample.

7) Set up 1: The Office of Student Services at a large western state university maintains information on the study habits of its full-time students. Their studies indicate that the mean amount of time undergraduate students study per week is 22 hours. The hours studied follows the normal distribution with a standard deviation of 5 hours. Suppose we select a random sample of 121 current students. What is the standard error of the mean?

Group of answer choices

0.455

6.000

0.252

2.001