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A data set consists of 83 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed. How many scores within this data set should lie between the mean and one standard deviation above the mean? Round your answer to the nearest whole number.
a fan is to produce an air curtain to separate a loading dock from a security room. the air curtain is a jet of air 8ft
specifically 68 of gen y people have a say in computer purchases. suppose you select a sample of 100 gen y
a store wishes to predict net profit as a function of sales for the next year. the following table gives the years 1998
While 290 out of 400 in Batavia preferred the same flavor. To test the hypothesis that there was no difference in preferences in the two towns, what is the alternate hypothesis?
a mineral economist estimated that a particular mining venture had probability 0.4 of a 30 million loss probability 0.5
Using variables below, (1) mention all research questions that would be replied with a Two Way ANOVA test, (2) make null hypotheses for these questions.
phone calls arrive at the rate of 9 per 15 minutes. compute the following probability by using poisson distribution no
All the pupils took the same achievement test, and the means for groups receiving different methods were compared. What was the dependent variable?
Suppose the people living in a city have a mean score of 48 and a standard deviation score of 7 on a measure of concerns about the environment.
The sample mean is 4.1 and the sample standard deviation is 1.4. It can be assumed that the population is normally distributed. The degrees of freedom associated with this are?
in a survey of women in a certain country ages 20-29 the mean height was 64.1 inches with a standard deviation of 2.99
If a null hypothesis is rejected at a significance level of .01, it will ______ be rejected at a significance level of .05
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