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For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The general population of individuals has a mean of 40, a standard deviation of 6, and follows a normal curve. For each sample, carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
h-p is said to be the leading seller of pc's in the U.S WITH 27% share of the pc market. if a researcher selects 130 recent pc purchases
If the life of wild pheasants follows a normal distribution with a mean of 9 months and a variance of 9, what percent of the population will be less than 11 months of age?
At the time she was hired as a server at the restaurant, Beth was told, "You can average more than $20 a day in tips." Over the first 31 days she was employed, the mean daily amount of her tips was $21.76,
Two rainstorms occurred in one week in a certain area. The first storm lasted 25 hours, and the second storm lasted 35 hours, for a total 2050ml of rain.
Is sample of 25 papers large adequate to give a good estimate of mean score of all 42,000 students on this exam problem? Explain your answer.
There is a 0.05 probability of thunderstorms in a major U.S. city. If there is a thunderstorm in that city, the probability is 0.28 that a flight departing that major city will be late.
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10. The upper and lower control limits, respectively, for an:
If sales is the variable you are trying to explain and you have 2 independent variables of color and price. The color coefficient is 100, and the price coefficient is -200. You have an intercept coefficient of 999 and an r-squared value of .2706. ..
A researcher determines that 42.7% of all downtown office buildings have ventilation problems. Is this a statistic or a parameter; explain your answer.
Studies have shown that humans complete a 1 mile run in an average of 12.2 minutes. There is a separate group of 30 who complete a 1 mile run with an average of 8.67 minutes with a standard deviation of 0.33 minutes.
Develop four probability questions using the table that you as an instructor of statistics might ask a class of students for a test in probability.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
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