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In New York State, savings banks are permitted to sale a form of life insurance called savings bank life insurance (SBLI). The approval process consists of underwriting, which comprise a revie
Assume you saw an email that stated that the mean age of employees in your company is less than 40 years and that more than 50% of the employees are female. By using the gender data only,
Test hypothesis that both propellants have the same mean burning rate. Use α=0.05. What is the P value? Make a 95% confidence interval on difference in means μ1-μ2. What is the practi
Make a 95 percent confidence interval for population proportion of positive drug tests. Why is the normality assumption not the problem, despite the very small value of p?
Describe the major points of the Central Limit Theorem for mean. Why is population shape of concern when estimating the mean? What does sample size have to do with it?
Assume there're 15 males and 35 females in our class. Of the 15 males, six are seniors. Of the 35 females, 13 are seniors.
Suppose now you take a random sample of three people from our class.
In Dallas, some fire trucks were painted yellow (instead of the red) to heighten their visibility-Describe the hypotheses. Describe the decision rule and sketch it. Find out the sample proportions and
Does lovastatin (cholesterol-lowering drug) minimize the risk of heart attack? In Texas study, researchers gave lovastatin to 2,325 people and inactive substitute to 2,081 people (average age 58). A
Describe the hypotheses for a right-tailed test. Obtain the test statistic and p-value assuming supposing equal variances. Interpret these results. Is the difference in mean scores large enough to be
Sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed the mean purchase of $5.29 with the standard deviation of $3.02.
In the bumper test, three kinds of autos were deliberately crashed in a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each and every type were crashed,
A student team examined parked cars in 4 different suburban shopping malls. One hundred vehicles were examined in each and every location. Research question: At _ = .05, does vehicle type vary by ma
Can people really recognize their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with results shown below. Research question: At _ = .05, is the corre
Faced with rising fax costs, the firm issued guideline that transmissions of 10 pages or more must be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below.
The coin biased toward heads? a) Show your decision rule and calculations. b) Compute a p-value and interpret it.
An auditor reviewed 25 oral surgery insurance claims from the particular surgical office, finding that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with the standar
What sample size would be required to obtain an error of ±10 square millimeters with 99 percent confidence. If this isn't a reasonable requirement, suggest one that is.
Biting an un-popped kernel of popcorn hurts! As the experiment, the self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in popper. After popping, the un-poppedkern
Test the hypothesis that the annual incomes of corporate trainers in areas of more than 500,000 are significantly more than those in areas of less than 100,000. Employ the 5% level of risk.
In the recent national survey, the mean weekly allowance for nine-year-old child from his or her parents was reported to be $3.65. A random sample of 45 nine year-olds in northwestern Ohio rev
Metro Real Estate Association is making the pamphlet that they feel may be of interest to prospective homebuyers in Middletown and Brockton areas of the city. One item of interest is the number of y
Harriet's Shoe Emporium operates stores in enclosed shopping malls and outlet malls. There're more than 1,000 stores during the United States and Canada. Harriet, the CEO, wishes to find out whether
A number of minor automobile accidents take place at many high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that the modification in the kind of light wil
Lester Hollar is vice president for human resources for large manufacturing company. In current years he has noticed the increase in absenteeism that he thinks is related to general health of employ