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A population standard deviation is estimated to be 13. We want to estimate the population mean within 1.7, with a 90-percent level of confidence. What sample size is required?
For full marks round your answer up to the next whole number.
Sample size: 0
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Is it reasonable to compute that the mean of the population is actually $15,000.
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.
From the shipment you take a random sample of 20. When sampling with replacement (binomial), determine the probability of obtaining: Exactly two defective components in the sample of 20.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
Assume that the bulb life is normally distributed. At the 10% significance level, do the data provide evidence that the mean life for the company's light bulbs differs from the advertised mean?
if they expect to satisfy about 80 orders in the next financial quarter, what is the probability that they will break their previous export record?
Compute the test statistic. Use the t distribution table to compute a range for the p value. What is the rejection rule using the critical value? What is the conclusion?
Satisfies each of the following statements. In each case, sketch a standard Normal curve and shade the area under the curve that is the answer to the question.
How many voters required to be sampled to evaluate the proportion within 0.05 with 95% confidence?
Suppose a single die is rolled once. You win $5 if a 1 or a 3 comes up, win $12 if a 5 comes up and lose $10 if a 2, 4, or 6 come up. What does the expected value tell you about the game?
I have 400 feet of lumber to frame a rectangular patio. I want to maximize the area of the patio. What should the dimensions of th patio be.
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