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At a particular uni the historical mean of scholarship examination scores for freshman application is 900. a historical standard deviation = 180 is assumed to be known, each year the assistant dean use a sample of application to determine whether the mean examination score for freshman application has changed. State the hypothesses.
At 5% level of significance, is true mean smaller than specification? Clearly mention your hypotheses and decision rule.
How is this relationship different from the bi-variate relationships?
Would it be reasonable to conclude that the population mean is 63 pounds?
Using 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
In government data, a household consists of all occupants of a dwelling unit, while a family consists of two or more persons who live together and are related by blood or marriage. So all families form households, but some households are not famil..
If the standard deviation of the amount of coffee dispensed is 0.4oz and the amount of coffee dispensed is normally distributed.
Suppose there was 2,500 cards in the inventory and how would the results be useful to the owner to estimate the total value of the inventory. What equation is best?
Assume that the heights of adult white men have a mean of 67.9 inches and a standard deviation of 2.8 inches. If 64 men are randomly selected, find the probability that they have a mean height greater than 68.9 inches.
A survey researcher compares 4 religious groups on their attitudes toward education. 1200 subjects receive the survey and 823 respond. There are 10 items; the likert scale is 1-5. A high positive score indicates a more positive attitude.
The following data provided by a coffee company are the roast time in minutes for five batches of coffee (x) and the resulting shrinkage in percent of the coffee weight(y).
Suppose the world series is about to begin. Some people get together and each decide to predict different win-loss patterns for the seven possible games during the coming series.
Why are samples studied when we want to know about populations? Why are random samples used instead of just any sample? How would you determine an appropriate sample size?
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