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NeverReady batteries has engineered a newer, longer lasting AAA battery. The company claims this battery has an average life span of 16 hours with a standard deviation of 0.7 hours. Your statistics class questions this claim. As a class, you randomly select 30 batteries and find that the sample mean life span is 15.7 hours. If the process is working properly, what is the probability of getting a random sample of 30 batteries in which the sample mean lifetime is 15.7 hours or less? Is the company's claim reasonable? (Round your probability to four decimal places.)
The company's claim is not reasonable because the probability that a sample of 30 batteries would have a lifetime of at most 15.7 hours is about _______________?
Give a 95% confidence interval for the average lengths of all pins produced.- Give a 99% confidence interval for the average lengths of all pins produced.
ACC 544 - What is the difference between a discrete probability distribution and a continuous probability distribution? Give your own example of each and describe the classical method of determining probability.
The standard hemoglobin reading for normal males of adult age is 15 g/100 ml. The standard deviation is about 2.5 g/100 ml. For a group of 36 male con- struction workers, the sample mean was 16 g/100 ml. Construct a 95% confidence interval fo..
answer the followinga- if the correlation coefficient is -0.15 what is the sign of the slope of the regression line?b-
below are data showing the results of six subjects on a memory test. the three scores per subject are their scores on
a discrete random variable has moment generating function mxt e2et-1.find exfind
Cite an example of how you could/would apply a test of a hypothesis for a single population proportion, two tail test described in the lecture to real world situations?
Suppose that 98% of the customers in your market have Internet access, and you select a random sample of 500 customers. What is the probability that the sample has:
Approval rating. A newspaper reports that the governor's approval rating stands at 65%. The article adds that the poll is based on a random sample of 972 adults and has a margin of error of 2.5%. What level of confidence did the pollsters use?
a fast food outlet claims that the mean waiting time in line is less than 3.7 minutes. a random sample of 20 customers
The e-operation applied to the preference probabilities of an alternative yields the same e-value as using the substitution rule for the prospects.
Are there differences across months? Do condo prices mirror home prices?" Why' are seasonally adjusted indexes published?
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