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A teacher believes that the class scores on a final examination should be approximately normal distributed. If this belief is correct, what proportion of the class should fall at or below the following z values?
a. -1.3
b. 0.94
c. 1.90
d. -1.76
e. -0.44
f. 2.17
The dimension is supposed to be 224 mm and the variance is unknown for the manufacturing process. Is there evidence that the mean dimension is not 221 mm? Assume the population is normally distributed. Use a = 0.05 and the critical value value met..
When would you use a hypothesis test for the difference in two population proportions at your place of employment, in your education, or in politics?
If two voters are randomly selected for a telephone survey, what is the probability that they one is a Republican followed by a Democrat? Round your answer to 4 decimal places.
What was the probability that a student worked a part time job or made the Dean's list. Interpret the results.
Let x = number of the ball obtained on any selection. Then the probability distribution for x is given by:
Explain the difference between the null and alternative hypothesis. Which one can be proven in a statistical sense?
If appropriate, find a 90% confidence interval for the population of all Americans who consider that the amount of federal income tax they pay as too high.
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
The manager of a car wash receives pricing schedule (shown below) from the vendor who supplies soap- and a promise of a 25% shorter lead time for deliveries.
In 36 randomly selected seawater samples, the mean sodium chloride concentration was 23 cubic centimeters per cubic meter and the standard deviation was 6.7 cubic centimeters per cubic meter (cc/cm).
Using a level of significance of .10, is there evidence that the population mean weight of the candy bars is greater than 7.3? Explain.
A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12. A random sample of 17 observations from the second population revealed a sample mean of 342 and a sample standard dev..
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