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A school claims that the average English regents' score of its students is at most 80. You sample 16 students and find that the sample mean is 75 and the sample standard deviation is 9
(a) Test the claim at the 0.1 significance level
(b) No claim was made by the school. They took a sample with the above results and want to construct a two-sided 95% confidence interval for the population mean. The upper limit of the confidence interval is:
Twenty customers are randomly sampled and questioned about the package. Let X denote the number of dissatisfied customers sampled.
Discuss and give examples of three methods that are used in marketing research for determining sample size.
a newspaper found the mean price for redwood city homes is 927200. with 18 homes sold in the past month the mean for
A coin is tossed ten times, with the likelihood of heads in each trial being 0.15. Let X be the number of times heads come up.
Golf scores. Here are the golf scores of 6 members of a women's golf team in the first two rounds of the National Collegiate Athletic Association tournament.
suppose small aircraft arrive at a certain airport according to a poisson distribution with a rate of 4 per hour. find
A doctorhas developed an experimental drug for toe-nail fungus. He needs to test it out on some people to make sure it works. He has a list of 2000 people who could be potential subjects in his study. 1120 of these potential subjects have toe ..
suppose you want to test the claim that u is gt or to 65.4. given a sample size of n 35 a level of significance of a
mark gershon owner of a musical instrument distributorship thinks that demand for guitars may be related to the number
A food inspector, examining 12 jars of a certain brand of peanut butter, obtained from the fofollowing percentages of impurities: 2.3, 1.9, 2.1, 2.8, 2.3, 3.6, 1.4, 1.8, 2.1, 3.2, 2.0 and 1.9.
Use the steps of hypothesis testing, (b) figure the effect size for the study; and (c) explain your answers to parts (a) and (b) to someone who has never had.
A random sample of 20 acres gave a mean yield of wheat equal to 41.2 bushels per acre with a standard deviation of 3 bushels.
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