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The following data values are a simple random sample from a population that's normally distributed with (symbol for variance) o2=4.0:
11,6,8,12 and 13.
Construct and interpret the 90% and 95% confidence intervals for the population mean.
Estimating the combined mean values for the given data - find the mean for the combined sample
Is the Euro fair? Soon after the Euro was introduced as currency in Europe, it was widely reported that someone had spun a Euro coin 250 times and gotten heads 140 times. We wish to test a hypothesis about the fairness of spinning the coin.
A sample of 60 night shift workers showed that the mean number of units produced was 351. At the .05 significance level, is the number of units produced on the night shift larger?
It has been evaluated that 30% of all farms are family-owned. In sample of 12 farms, determine the probability that exactly 3 farms are family owned?
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
Test hypothesis that average price of gasoline in western states is higher than national average for Continental USA and the District of Columbia, i.e., higher than $3.74.
What is the stock's value at it's highest on 15 days of the year? (Assume that there are 240 trading days in a year).
A survey found that the variance of the rental rates on 8 cars at the airport was 35.7 while the variance of the rental rates on 5 cars down town was 50.4. What test value should be used in a F test?
Diagnosis tests of medical conditions have several results. The test result can be positive or negative, whether or not a patient has the condition.
Compare the means of two populations using 96% confidence interval:
As the Marketing Director of Harley-Davidson, you need to determine what your customers would like in the next model. You put a survey on the Harley Web site. Is this a good frame from which to select your sample? Explain.
A simple random sample of 50 adults is obtained, and each person's red blood cell count (in cells per microliter) is measured. The sample mean is 5.23 and the sample standard deviation is 0.54. Use a 0.01 significance level to test the claim that ..
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