Prompt B: The population has a mean of 5 and a standard deviation . A sample of 100 is taken.

Prompt B: The population has a mean of 5 and a standard deviation . A sample of 100 is

taken.

According to Prompt B, What is the standard deviation of the sampling distribution?

a) .014 b) .14 c) 14 d) 1.4Prompt B: The population has a mean of 5 and a standard deviation

. A sample of 100 is

taken.

According to Prompt B, What is the probability that your sample has a mean less than 4.9?

a) .7625 b) .8164 c) .2675 d) .1234

Given a normal distribution with a mean of 22 and standard deviation of 25, what is the

probability that x is greater than 34.3?

a) .0069

b) .3114 c) 0

d) .9931A hypothesis test is done in which the alternative hypothesis is that more than 10% of a population is left-handed. The p-value

for the test is calculated to be 0.25, so the researcher fails to reject the null hypothesis. Which statement is correct? a) We cannot conclude that more than 10% of the population is left-handed.

b) We can conclude that exactly 25% of the population is left-handed.

c) We can conclude that more than 25% of the population is left-handed.

d) We can conclude that more than 10% of the population is left-handed.Given a normal distribution with a mean of 22 and standard deviation of 5, what values represent the middle 95%?

a) 17, 27 b) 22

c) 8,37 d) 12, 32

DDT is an insecticide that accumulates up the food chain. Predator birds can be contaminated

with quite high levels of the chemical by eating many lightly contaminated prey. It is believed that

this causes eggshells to be thinner and weaker than normal and makes the eggs more prone to breakage. A studywas conducted of eggs laid by contaminated birds. A “normal” eggshell has a mean thickness of 0.2 mm, but the researchers wanted to investigate the claim that the eggshells were thinner than normal. What would be an appropriate null and alternative hypothesis?Decreasing the confidence level, while holding the sample size the same, will do what to the

length of your confidence interval?

a) cannot be determined from the given information b) make it smaller

c) make it bigger

d) it will stay the samePrompt C: A sample of 16 college students with part-time jobs were asked how much money they made in the past two months. The result was a mean of $645 with a standard deviation of $31. We will construct a 95% confidence interval for the mean using a T-distribution.

According to Prompt C, What is the critical value for this confidence interval?

a) 2.120 b) 2.602 c) 2.131 d) 1.96

Prompt C: A sample of 16 college students with part-time jobs were asked how much money they made in the past two months. The result was a mean of $645 with a standard deviation of $31. We will construct a 95% confidence interval for the mean using a T-distribution.

According to Prompt C, What is the margin of error for this confidence interval? a) $15.19

b) $31

c) $66.06 d) $16.52Prompt C: A sample of 16 college students with part-time jobs were asked how much money they made in the past two months. The result was a mean of $645 with a standard deviation of $31. We will construct a 95% confidence interval for the mean using a T-distribution.

According to Prompt C, What is the 95% confidence interval for the average amount of money earned in 2 months?

a) (321.7, 365.8) b) (531.2, 612.9) c) (876.2, 981.5) d) (628.5, 661.5)

Prompt E: Susie and Joan complain that they make very little money at their jobs; they are both radio announcers. The population of radio announcers averages $27,000 per year with a standard deviation of $5,300. Susie makes $25,000 per year and Joan makes $32,500.

According to Prompt E, what is the z-score for Joan’s salary?

a) .47

b) -.94

c) .94

d) -.47Prompt E: Susie and Joan complain that they make very little money at their jobs; they are both radio announcers. The population of radio announcers averages $27,000 per year with a standard deviation of $5,300. Susie makes $25,000 per year and Joan makes $32,500.

According to Prompt E, what salary corresponds with a z-score of 1.5?a) $22,200

b) $-19,550

c) $32,800

d) $35,450

Prompt E: Susie and Joan complain that they make very little money at their jobs; they are both radio announcers. The population of radio announcers averages $27,000 per year with a standard deviation of $5,300. Susie makes $25,000 per year and Joan makes $32,500.

According to Prompt E, What salary corresponds with 75th percentile?

a) $31,075

b) $22,800 c) $25,450 d) $32,800

True or False. The more samples you take the more your sampling distribution becomes more

normal centered around the true proportion/mean. a) True

b) Have a great summer

c) False

d) Stats is the best class ever