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Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
i) Drawing the standard normal curve and indicating the area representing the probability and
ii) Calculating the probability using P (-1.49 < z < 1.35).
Find out 90% confidence interval for mean grade of all the students in the class.
A chance sample of 50 families revealed an average or median of $112,000 and a standard deviation of $40,000. What is the standard error of the average or median?
Find out the test statistic s and its two-sided P -value. Do data give good evidence that population mean is not zero?
Determine the probability that person selected has blood type O? Given that person selected is a male, determine the probability that their blood type is AB?
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
During the 2003 season, MLB took steps to speed up the play of baseball games in order to maintain fan interest; the following results come from a sample of 60 games played during the summer of 2002. And a sample of 50 games played during the summ..
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
The width of a confidence interval will be:
Draw and label distribution used and position of values found.
Determine the probability that tire wears out before 70,000 miles?
Is global F ratio significant? Identify this F ratio, and describe whether it is important.Is coefficient for X1 (productivity) significant? How do you know? Mention its t value and accompanying P-value.
We are establishing a quality control program for a process and need to establish the mean and standard deviation for the process. The first 10 batches had samples of size 5 taken.
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