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1. 1,600 of 2,000 voters say they plan to vote Republican. Use 0.95 degree of confidence to find the popltn proportion interval.
A. 69.2 to 86.4%
B. 76.5 to 83.5%
C. 77.7 to 82.3%
D. 78.2 to 81.8%
E. none of the above
2. The mean weight of trucks traveling on the the highway is unknown. A state highway inspector needs an estimated mean. He selects 49 trucks passing the weighing station and gets a mean of 15.8 tons, w/ standard deviation of the sample of 3.8 tons. Using the 0.95 degree of confidence, what is the confidence interval w/in which the population mean lies?
A. 14.7 and 16.9
B. 13.2 and 17.6
C. 10.3 and 20.4
D. 16.1 and 18.1
Construct a 90% confidence interval for the standard deviation of the number of hours this firm's employees spend on work-related activities in a typical week.
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
Do the data provide significant support for any preferences among the three brands? Test At the .05 level of significance.
The National Turkey Association wants to experiment with three different feed mixtures for very young turkeys. Since no experience exists regarding the three mixtures, no assumptions can be made about the distribution of weights.
A seminar is given to three levels of managers (highlevel, midlevel, lowlevel).The facilitators believe the evaluations may vary with the audience.
A marketing research analyst collects data for a random sample of 100 customers out of the 400 who purchased a particular "coupon special".
What is the mean of the sample proportion of pieces of unread mail? What is the standard error of the sample proportion?
If there is relationship between parental income and SAT score, why can't we bring to a close that differences in score are caused by differences in parental income.
Because of a recent incident in which a number of people became ill after eating undercooked hamburger meat, intensive interest has centered around the cooking time for hamburger patties.
Accidents at a chemical plant occur at a rate of 1.9 per month. Find: The expected number of accidents in a year? The probability of no accidents next month?
If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are queens. A fair coin is tossed 8 times in succession. Find the probability of getting at least 4 heads.
The 30 members of an orchestra were asked how many instruments each could play. The results are set out in the frequency distribution. Calculate the mean number of instruments played:
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