Suppose that a scientist has 60 mice that he could use in an experiment involving a new drug to treat a certain disease.  The scientist decides to use 6 of the 60 available mice for a small preliminary experiment before conducting a larger study.  The scientist arbitrarily begins at row 20 column 1 of the random number table and goes from left to right across the row.  Which one of the following is the correct random sample of 6 mice? For your convenience, here are rows 20 and 21 of the random number table:       Column       Row 1 2 3 4 5 6 20 07056 97628 33787 09998 42698 06691 21 48663 91245 85828 14346 09172 30168

Humans possess two sex chromosomes.  A copy of one or the other (equally likely) is contributed to each offspring.  Males have one X chromosome and one Y chromosome.  Females have two X chromosomes.  If a couple has 3 children, what is the probability that they will have at least one boy?

The symbol for the variance of a sample is _______.

Which one of the following is not an assumption that must be met in order for a linear regression analysis to be valid?

A physical fitness association is including the mile run in its secondary-school fitness test for boys.  The time for this event for boys in secondary school is known to have a normal distribution with a mean of 450 seconds and a standard deviation of 50 seconds.  The fitness association wants to recognize the fastest 10% of the boys with a certificate of achievement.  What time would the boys need to beat in order to earn a certificate of achievement from the fitness association?

You are interested in purchasing a new car.  One of the many factors you wish to consider is the resale value of the car after 5 yr of ownership.  Since you are primarily interested in the Toyota Camry, you decide to estimate the resale value of the Camry with a 90% confidence interval.  You manage to obtain data on 17 recently resold 5-yr-old Camrys and derive a 90% confidence interval that is equal to ($10,400,  $14,400).  How could we alter the sample size and confidence coefficient in order to decrease the width of this confidence interval?

Assume that the mean length of time required to complete the Columbus Marathon was 4.5 hours and that the standard deviation of the times was 0.50 hours.  Assume that the racing times were approximately normally distributed.  What is the probability that a randomly selected runner completed the race in less than 3.6 hours?

In order to compare the means of two populations, independent random samples of 400 observations are selected from each population, with the following results:                                              Sample 1    Sample 2 Sample size                             400             400 Sample mean                           5,275         5,240 Sample standard deviation      150            200 Which one of the following is the correct 92% confidence interval for the difference in the two population means?

Frame score in beef cattle is based on height at the hips and is used as a measure of skeletal size.  Frame scores range from 1 to 10 with a higher number indicating a taller animal.  Independent random samples of frame scores were selected from the Angus and Simmental breeds of beef cattle with the following results: Angus Simmental 5 7 6 7 7 8 5 6 7 7 6   Calculate the Correction Factor (Correction for the Mean).

Suppose that we want to make an inference about the population proportion (p).  For sufficiently large sample sizes, the sampling distribution of p-hat is approximately normally distributed with mean equal to __________.