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With a 98% level of confidence a company producing street signs wants to make sure the length of their product is meeting quality standards.
Error of 1cm and the production manager knows that the Standard Deviation 6cm. How many signs does he need to sample?
In a goodness-of-fit test where the sample size is 200, there are 5 categories, and the significant level in .05. The critical value of X2 is.
Last year, there were 30,000 students at a university; their GPA had a mean of 2.9 and an SD of 0.6. This year, in a simple random sample of 100 students taken from this university, the GPAs have a mean of 2.95 and an SD of 0.55. Has the mean GPA ..
Make use of normal probability distribution features of EXCEL to help determine the probability.
Develop a linear regression equation for these data and forecast how much money Robert will win if he spends $30.
In a random sample of 400 items, 88 are defective. If the null hypothesis is that 20% of the items in the population are defective, what is the value of ZSTAT?
In an analysis of variance problem involving 3 treatments and 10 observations per treatment, SSE = 399.6. The MSE for this situation is:
Construct a 99% confidence interval for the proportion of customers favoring underground installation.
Construct a 95% confidence interval for the population mean, assuming a normal distribution?
Using given data table, find out midpoint for class with greatest frequency?
Draw the suitable 2x2 table, compute and interpret suitable measure of association.
Perform a significant test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank sum test, evaluate the significance of the results, assuming there are no ties.
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