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1. A random variable is binomially distributed with n = 16 and π = .40. The expected value and standard deviation of the variables are:
A. 2.00 and 1.24 B. 4.80 and 4.00 C. 6.40 and 1.96 D. 2.00 and 1.20
2. If σ = 12, find the sample size to estimate the mean with an error of ± 4 and 95 percent confidence (rounded to the next higher integer).
A. 75 B. 35 C. 58 D. 113
3. The owner of Torpid Oaks B&B wanted to know the average distance its guests had traveled. A random sample of 16 guests showed a mean distance of 85 miles with a standard deviation of 32 miles. The 90 percent confidence interval (in miles) for the mean is approximately:
A. (71.0, 99.0) B. (71.8, 98.2) C. (74.3, 95.7) D. (68.7, 103.2)
Construct a 99% confidence interval (Konfidenz interval) for the difference in proportions of all adults and all teenagers who watched the program and liked it.
test at the 0.01 level, was the mean time for the Delta visits significantly less than that for the British Airway visits? Identify and interpret the p-value for the test.
The manufacturer of a new line of ink jet printers would like to include as part of their advertising the number of pages a user can expect from a print cartridge.
State a hypothesis related to this study that would cause you to conduct a one-tailed test. State a hypothesis related to this study that would cause you to conduct a two-tailed test.
He will then compare the season batting averages of group A (those with ballet training) and group B (those without ballet training) by comparing the mean of group A with the mean of group B.
Write the stems again, and rearrange the leaves in increasing order out from each stem. We are interested in the distribution of the data? What would be appropriate to display this?
If the researchers test 95- newborns for the presence of this gene, would it be unlikely for them to find fewer than 25 children with the gene?
A die is loaded in such a way that the probability of each face turning up is proportional to the number of dots on that face. What is the probability of getting an even number in one throw?
In a random sample of 16 mountain climbers who are going to attempt Mt. McKinley what is the probability of each of the following All 16 reach the summit.
Plasma glucose levels are used to determine the presence of diabetes. Suppose the mean in (plasma-glucose) concentration (mg/dL) in 35-44 year olds is 4.86 with standard deviation = 0.54.
The sample mean is at the 5th percentile for the SDSM? What is the sample mean? Give your answer correct to two decimal places.
At the 0.01 significance level, can we conclude that the mean number of patients per day is more than 25? Estimate the p-value and interpret it.
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