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Assume that the heights are normally distributed (they probably are not) and use your results from #2 as estimates for μ and σ. Find the probability that a sample of 36 statistics students at DTCC has a height of 65 inches or taller.
Heights of Statistics Students at DTCC, in inches67 66 62 66 64 68 67 68 66 69 62 66 6262 64 62 65 68 67 61 65 68 71 69 62 6566 64 61 62 63 68 62 63 71 64 68 65 6471 72 71 61 77 70 71 72 70 71 75 74 6573 69 71 75 68 67 68 71 74 72 70 74 66
You wish to evaluate the proportion of customers who are satisfied with their supermarket at level of confidence of .92 and in .025 of true value. How large of sample is required?
A random sample of 56 fluorescent light bubs has a mean life of 645 hours with a standard deviation of 31 hours.
Is there a relationship between sales and newspaper advertising? Support your answer?
Provide an example and state the Null and the Alternative hypothesis for the example in symbolic form.
If the sample mean lifetime of the 100 batteries were 36.7 hours. would you find the manufacturer's claim plausible? Explain.
Conduct the most appropriate hypothesis test using a 0.05 significance level to determine if there is a statistically significant difference between the reading of both instruments.
In a group of 6 computer programmers, what is the probability that none are introverts? What is the probability that 4 or more are introverts?
The mean maximum oxygen uptake for elite athletes has been found to be 80 with a standard deviation of 8.1. Assume that the distribution is approximately normal.
Other group (drawing 6 slips without replacement from among 45). What is the probability that at least one of the shifts will be unrepresented in that sample of workers?
For the following situation, assume the random variable is normally distributed and use a normal distribution or a t-distribution to construct a 90% confidence interval for the population mean. If convenient, use technology to construct the confid..
A coin was flipped twenty times and landed heads fifteen times. Based upon this information, answer the following the question:
Specify the appropriate null and alternative hypotheses if we wish to test the research hypothesis that the mean GHQ score for all employed men exceeds 10.
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