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The following data were obtained from an independent measures study. Determine if there is a significant difference between the treatments. Use a significant level of .01.
Treatment 1 Treatment 25 61 102 143 124 18
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
A IRS auditor randomly selects 3 tax returns from 57 returns of which 6 contains errors. What is the probability that she selects none of those containing errors?
An insurance representative wants to determine if the proportions of women and men who buy the different policy types are the same. The actual sales results for 50 women and 50 men are
SAT Math scores have a bell-shaped distribution with a mean of 515 and a standard deviation of 116. a) what percentage of SAT scores are between 399 and 631?
Use the binomial distribution to determine the probability that a student will get at least 8 out of 10 questions on a ten question multiple choice test correct by just guessing if each question has four
Compute mean absolute percentage error (MAPE) of the forecasts.
If new inspector measures 101 stampings with variance of 0.13 square inch, test at 0.05 level of significance whether inspector is making satisfactory measurements. Suppose normality.
The annual returns, in percentages, on stocks A and B for three possible states of the economy are given in the table below.
Test the claim of the brewery about the mean volume equal to 32 oz. at the 0.05 significance level. It's your choice whether to use z or t.
Assume that the underlying population variances are equal. a. Are the two samples paired or independent?
Evaluate 2-month moving average and Exponential smoothing by MAD.
Computing the probability values using normal distribution - what proportion have SAT scores greater than 550?
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