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The previous exercise is very important to your understanding of tests of significance. If you don't use the applet, you should dothe calculations by hand. (Your results may differ slightly from those obtained bythe applet due to rounding error.) Find the P -value in each of the followinghypothetical situations:
(a) We measure the acidity of rainfall on 5 days. The average pH is x = 4 . 8.
(b) Use a larger sample of 15 days. The average pH is x = 4 . 8.
(c) Finally, measure acidity for a sample of 40 days. The average pH is x = 4 . 8.
For the constant sound group: 1, 10, 1, 10, 1, 9, 7, 3. And for the no sound group: 4, 3, 6, 4, 5, 8, 4, 9. A. Assume that the standard deviations are equal and find the test statistic for the test that the between mu1 and mu2 is zero.
A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 12.7 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
Describe a business-related situation in which you would expect there to be a strong relationship (correlation) between an independent and dependent variable.
In drawing an inference using a single mean in hypothesis testing, you often have a choice between doing a z-test or a t-test. Many researchers will always choose to do the t-test even under circumstances where the z-test would work as well.
State the null and alternative hypotheses to determine if the average number of hours until spoilage begins differs for the preservatives A and B?
Would it be unlikely for them to find fewer than 65 children with the gene? Calculate the z-score and base your response upon the z-score.
Based on these data, explain whether or not course attendance had any effect on determining of a restaurants violation of health code.
The total cholesterol level of US females 2 years old or older is normally distributed with a mean of 206 mg/dl and a standard deviation of 44.7
Interpret the correlation between each set of variables.
A local university administers a comprehensive examination to the recipients of a B.S. degree in Business Administration. A sample of 5 examinations are selected at random and scored. The test scores are 56, 85, 65, 86, and 93. At 98% confidence, ..
Assume the standard deviation of the distribution is 2.5 pounds. Find the probability that the mean of a sample of 55 families will be between 17 and 18 pounds.
The width of a rectangular playground is 2x-5 feet and the length is 3x+9 feet. Write a polynomial P(x) that represents the perimeter and then evaluate this perimeter polynomial if x is 4 feet.
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