Question: A fair six-sided die, with sides numbered 1 through 6, will be rolled a total of 15 times. Let x¯1 represent the average of the first ten rolls, and let x¯2represent the average of the remaining five rolls. What is the mean μ(x¯1−x¯2) of the sampling distribution of the difference in sample means x¯1−x¯2 ?

Answer: b. 3.5−3.5=0

Question: A certain statistic dˆ is being used to estimate a population parameter D. The expected value of dˆ is not equal to D. What property does dˆexhibit?

Answer: e. dˆ is biased

Question:

Answer: b. The sample sizes are both sufficiently large.

Question:

Answer: c.

Question: Two non-profit organizations, L and M, accept donations from people. In a certain month, 140 people donated to organization L, with an average donation amount of x¯L=$113, and 42 people donated to organization M, with an average donation amount of x¯M=$390.

Answer: e. Dollars

Question: Samples G and H were selected from the same population of quantitative data and the mean of each sample was determined. The mean of sample G is equal to the mean of the population.

Answer: e. II and III

Question:

Answer: b

Question: The continuous random variable N has a normal distribution with mean 7.5 and standard deviation 2.5. For which of the following is the probability equal to 0 ?

Answer: a. P(N=8)

Question: Clara recorded 50 numerical observations on a certain variable and then calculated the mean x¯ and the standard deviation s for the observations. To help decide whether a normal model is appropriate, she created the following chart.

Answer: a. 1, 7, 34, 7, 1

Question: The mean number of pets owned by the population of students at a large high school is 3.2 pets per student with a standard deviation of 1.7 pets. A random sample of 16 students will be selected and the mean number of pets for the sample will be calculated.

Answer: b. 3.2