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Q1. The grades of 20 students are listed below. Use the stem & leaf to determine the shape of the distribution. Choose the best answer.
4 | 45 | 6 86 | 5 7 97 | 1 5 7 8 8 98 | 3 4 5 7 8 8 99 | 7
Q2. A researcher is considering using 90% confidence interval for his research project instead of 95%. What happens to the required sample size if the confidence level is decreased from 95% to 90% and the same error margin is allowed in each case?
Q3. Horse race time is found to be normally distributed with a mean value of 18 minutes and a standard deviation of 4 minutes. Horses whose race time is in the top 6% will not be eligible to participate in a second round. What is the lowers race time that makes a horse losses his eligibility to participate in a second round?
Q4. A class containing 25 students 12 of them are females. In how many ways can we select a group of 6 male students?
Q4. Research shows that the life time of Everlast automobile tires is normally distributed with a mean value of 65,000 miles and a standard deviation of 6,500 miles. What is the probability of having a tire that lasts more than 75,000 miles?
Rental car gasoline prices per gallon were sampled at eight major airports. Date for Hertz and National car rental companies follow (USA today April 4, 2000)
Why might driver be tempted not to use seat belt "just on this trip"?
Wwhat can we say about the shape of the distribution of the sample mean? What is the standard error of the mean?
Calculate 95 percent and 99 percent confidence intervals for m. Using the 95 percent confidence interval, can we be 95 percent confident that m is at least 50 pounds? Explain.
What are the most important concepts you have learned from conduct one-and two-sample tests of hypotheses? What would you recommend to your management/leadership based conduct one-and two-sample tests of hypotheses?
I need to collect both primary and secondary data regarding the research issue on salary of baseball players. (the aim of this research is to verify whether the salary of the baseball players varies with respect to the state)
A recent study of 75 workers found that 53 people rode the bus to work each day. Find the 95 percent confidence interval of the proportion of all workers who rode the bus to work.
(a) What is the relative frequency (i.e., proportion) of observations falling in the 0.260-0.280 interval? (Give your answer to four decimal places.) (b) What is the shape of the data distribution?
A car manufacturer tests the first 1,000 cars coming off the assembly line to see if their new anti-lock braking system works correctly. Use the typical values for control limits.
Peter, Paul, Mary, John and Martha are members of the pastoral council at a localchurch. They are to be seated at one side of a long conference table in a pastoral councilmeeting.
The time required to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. Answer the following questions. a) What is the probability of completing the..
In other words, what other variables might you collect that you might plausibly expect to have an impact on the change in test scores aside from income and the curriculum type?
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