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Some numbers are not normally distributed. If the mean of the numbers is 38 and the standard deviation is 6, what proportion of values would fall between 26 and 50? What proportion of values would fall between 14 and 62? Between what two values would 89% of the values fall?
students in an introductory statistics class were asked to report the age of their mothers when they were born.
Jim Sears manufactures farm equipment. His work requires the use of steel bars which must have a mean length of at least 50 inches. The bars can be purchased from a supplier in Kansas
The remainder are defective. If 4 of the products are randomly selected, find the probability that all of them are acceptable.
Find the probability that a randomly selected student is a male binge drinker, and find the probability that a randomly selected student is a female binge drinker.
estimating the combined mean values for the given data.one sample of n 4 scores has a mean of m 10 and a second
The mean score in the male group was 84±4.0 (M±SD); in the female group, it was 78±8.0 (M±SD) points. If the null hypothesis is that there is no difference in exam scores, then test the null hypothesis at a 0.05 level of significance.
A normal distributed population has a mean of 250 pounds and a standard deviation of 10 pounds. Given n = 20, what is the probability that this sample will have a mean value between 245 and 255 pounds?
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
At the 0.05 level, is the 40% rate significantly greater than the 35% that had been occurring in the past, or might this higher rate be simply due to chance variation? Identify and interpret the p-value for the test.
0Compare two versions of a product. A coffeehouse wants to compare two new varieties of coffee.
Suppose no prior estimate of p^ is known. How large a sample is necessary for the bound on the error of estimation to be 0.04 with confidence level 90%?
Mike has est that the store sells about 800 SONY sets annually. Estimated holding cost is $30 per set and ordering cost is $20 per order. Describe the inventory pattern graphically.
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