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What is the 90% confidence interval for the standard deviation, s, of birth weights at County General Hospital, if the standard deviation of the last 22 babies born there was 1.5 pounds.
A random sample of 20 fish were taken from the day's catch of fish in Toxic Bay and the mean level, of a chemical herbicide in their blood was found to be 20 parts per million with a standard deviat
In 1965, about 44% of the U.S. adult population had never smoked cigarettes. A national health survey of 1472 U.S. adults (presumably selected randomly) during 2010 revealed that 677 had never smok
The manager of the dairy store wants to determine the proportion of people who buy milk each day. Throughout one day, 150 out of 250 people bought milk. What is the 99% confidence interval for the t
A current study of 900 internet users in Europe found that 20% of internet users were women. What is the 99% confidence interval of the true proportion, p, of women in Europe who use the internet?
For each of the following, indicate whether it is resistant to outliers or not. Do not bother to explain your answers, except for the last one.
Develop a hypothetical example of ten exam scores (between 0 and 100, inclusive, possibly including repeats) so that the mean is greater than two times the median. Also report the values of the mean
Which one (Ben or Frank) would you expect to have the greater standard deviation of temperatures, or would you expect the standard deviations to be very similar? Explain briefly.
A candidate for one of Ohio's two U.S. Senate seats desires to compare her support among registered voters in the northern half of the state with her support among registered voters in the southern
Fifteen different Thursday evening programs reported that a commercial cost an average of $169,000 with a standard deviation of $81,000. What is the 99% confidence interval for the true mean, m, cor
The average cost of living for a family of 4 in twelve different cities was found to be $65,351 with a standard deviation of $7711. In dollars, what is a 90% confidence interval for the true mean, m
A researcher studying the effect of price cuts on consumers' expectations makes up two different histories of the store price of a hypothetical brand of laundry detergent for the past year.
Assume that the average length of the passenger cars in the United States is 21.4 feet with a standard deviation of 1.3 feet and that car length is normally distributed. Then what percentage of thes
Develop a 95% confidence interval for p1-p2. The sample statistics listed below are from independent samples.
Determine the conditional probablity of a request for additional information given that the bid will ultimatley suceed. Calculate a posterior probablity that the bid will be successful given that a r
The scores on the Wechsler Adult Intelligence Scale are approximately Normal with ? = 100 and ? = 15?
Which of the following statements is false?
A candidate for one of Ohio's two U.S. Senate seats wishes to compare her support among registered voters in the northern half of the state with her support among registered voters in the southern h
In the past decades there have been intensive antismoking campaigns sponsored by both federal and private agencies. In one study of national smoking trends, two random samples of U.S. adults were se
At a large university, an SRS of 25 male faculty members included 10 that felt that the university was supportive of female and minority faculty.
A description of different houses for sale includes the following variables. Which of the variables is categorical?
Find the critical value Zc necessary to form a confidence interval at the level of confidence c=0.83
A normal population has a mean of 0.1 and a standard deviation of 2.1. What is the probability that the mean of a simple random sample of 900 members will be negative?
Incomes of junior executives are normally distributed with a standard deviation of $3,828. What is the mean for the salaries of junior executives if a salary of $62,900 is at the top end of the middl
Melanoma is the most serious form of skin cancer and is increasing at a rate higher than any other cancer in the united states. If it is caught in its early stage, the five year survival rate for pa