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Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
Population
Study _ _ Sample Score p Tails of TestA 5 1 7 .05 1 (high predicted)B 5 1 7 .05 2C 5 1 7 .01 1 (high predicted)D 5 1 7 .01 2
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
The Food King Chain employs more than 3,000 people. The worker's ages are approximately normally distributed, with a mean of 31 years and a standard deviation of 4.3 years.
Use the .05 significance level and the 5 step hypothesis testing process to check if there is a difference in the mean flight times among the three airlines.
An issue that faces individuals investing for retirement is allocating assets among different investment choices. A study conducted 10 years ago showed that 65% of investors preferred stocks to real estate as an investment.
A company tracked the number of complaints it received during the first 6 months of last year, as shown in the following table:
Use the histogram to determine how many points are out of control according to the upper control limit and lower control limit.
Random sample of round-trip discount fares on this route last month gives: At .01 significance level can we conclude that mean fare has increased? Determine the p-value?
If code is 4 random letters, and letters can be utilized multiple times, how many different possible codes are there?
A random sample of 20 patients in a weight loss clinical trial lost an average of 25 pounds over an 8 week period. The sample standard deviation is 10.
What is the marginal revenue equation? Find the output to the nearest thousand cameras that will produce the maximum revenue. What is the maximum revenue?
4th graders in the US take a standardized test for math. The national average score is 237. Did your state, as represented by your students, out perform the national average using a statistically significant measure?
The condition for the question is that the deck of cards has 52 cards and among them are 12 face cards. What is the probability of choosing 6 face cards out of 8 chosen. Thru Binomial distribution holds( meaning with replacement)
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