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**cassrl**- Replies: 1

A standard measure of test anxiety is knnown to produce a u=19. In the sample you draw of 86 the mean is equal 17.5 with a standard deviation s=10.

a-Use a level of 0.05 to test the hypothesis that the mean is less than 19.

b-find the 95% one sample confidence interval for the mean.

**cassrl**- Replies: 1

Mean proportion of individuals is p=0.30, sample size is 25 from this population, what fraction will have a sample porportion of 0.20 or lower?

**cassrl**- Replies: 1

X score is normally distibuted with mean 90 and standard deviation 23 Find:

A-the probability of a score between 76 and 117

b-probability that the mean score of a sample of n=64 is greater than 97

**cassrl**- Replies: 1

Top 12% of the class will an A. Mean grade is 72 and the standard deviation is 10. What grade would you need to earn an A?

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