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A sample of the monthly amounts spent for food by families of four receiving food stamps approximates a symmetrical, bell-shaped frequnecy distribution. The sample mean is $150; the standard deviation is $20.
a) About 68 percent of the monthly food expenditures are between what two amounts?
b) About 95 percent of the monthly food expenditures are between what two amounts?
The lifetime of a disk drive head is normally distributed with a population mean of 1000 hours and a standard deviation of 120 hours. Determine the probability that the lifetime for 9 disk drives will exceed 940 hours.
A standard deck of playing cards contains 52 cards divided equally into four suits: Spades, Hearts, Diamonds, and Clubs. Each suit contains thirteen cards: 2, 3, 4, 5, 6, 7, 8, 9, 10, J(ack), Q(ueen), K(ing), A(ce).
Using the .01 significance level you will test to conclude if the analyst finds evidence that the boast of dealership A is correct. What will be your critical value?
Based on these results, a confidence interval for the population mean is found to be u = 5.7 PLUS OR MINUS 4.4. Find the degree of confidence.
Finds that 3 contain errors. If the accountant's theory is correct, what is the probability that at least 3 invoices contain errors in a random sample of 10?
give two suggestions regarding how a statistician might generate probability estimates when empirical data is
in an illustration of normal probabilty distribution a shaded are represents
a researcher wants to know if the amount of calories in a meal from five different restaurants is different. what type
Would you recommend test- ing H0 : m = 5 versus Ha : m> 5 or H0 : m= 5 versus Ha : m
A researcher used stepwise regression to create regression models to predict Birthrate (births per 1000) using five predictors:
which of the following is not an assumption for one-way analysis of variance?the p populations of values of the
Weekly income of more than $429.35, the value of the standard deviation of the weekly earnings of the bus drivers is 15. is it true?
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