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1) Public health officials claim that people living in low income neighborhoods have different Physical Activity Levels (PAL) than the general population. This is based on knowledge that in the U.S., the mean PAL is 1.62 and the standard deviation is 0.46. A study took a random sample of 43 people who lived in low income neighborhoods and found their mean PAL to be 1.52. Using a one-sample z test, what is the z-score for this data? (Answer to 2 decimal places)
2) What is the critical value of z in the previous question? Report the critical value CLOSEST to your calculated z-score. (Answer to 2 decimal places.)
Random sample of 100 pieces of wire and wants to see if the thickness of a batch of wire meets minimum specifications. Assume that the population mean is 0.45 inch, with a standard deviation of 0.03 inch.
Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective.
A financial analyst wants to compare the turnover rates, I percent, for shares of oil-related stocks versus other stocks, such as GE and IBM. She selected 32 oil related stocks and 49 other stocks.
five workers are available to perform four jobs. the time it takes each worker to perform each job is given in
Mr. Smith had 11 stocks that averaged 11.3 percent with a standard deviation of 3.2 percent. At the .02 level of significance, can we conclude that Mr. Jones' stocks have a different variation?
describe the differences between correlations and regressions. can you describe situations where you would use one of
A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business dinners was $6.12 and the variance of 12 business l..
From this small sample, the mean heart rate is 90 beats per minute with a standard deviation of 5. Find a 98% confidence interval for the true mean heart rate of all people with this untreated condition.
a specific automotive part that a service station stocks in its inventory has an 8 chance of being defective. suppose
A party, and 35% stay home. Seventeen people are randomly selected. Can the probability that exactly 4 of them stay home be computed using a binomial model?
Formulate West's production-mix decision as a linear programming problem, and solve. NOTE: This problem must be solved using one of the following methods. How many tables and bookcases should be produced each week?
the line width of for semiconductor manufacturing is assumed to be normally distributed with a mean of 0.5 micrometer
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