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Suppose that the lengths are normally distributed. A quality specialist collects a random sample of 16 rods and finds the sample mean length to be 14.8 feet and a standard deviation of 0.65 feet. Which of the following statement is true?
a, The standard error is 0.65 feet
b. The sampling distribution for the sample mean is Normal with a mean of 14.8 feet and standard deviation of .65 feet
c. The mean of the sampling distribution for the sample mean is 14.8 feet
d. The sampling distribution for the sample mean follows the t-distribution with 15 degrees of freedom.
e. the sampling distribution for the sample mean follows the t-distribution with 16 degrees of freedom
In a sample of 60 mice, a biologist found that 46% were able to run a maze in 30 seconds or less. Find the 99% limit for the population proportion of mice who can run that maze in 30 seconds or less?
Find the probability that a random selection of 9 songs will have mean length of 186.30 seconds or less. Assume distribution of the lengths of the songs is normal.
Machine is not filling the bottles completely. A sample of 8 bottles is taken. Is there enough evidence to support the consumer's conjecture at alpha = .10?
A recent national study showed that approximately 30% of college students binge-drink. Let x equal the number of students in a random sample size of n=12 who binge drink. Find the probability that
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Create a research question for which the appropriate test of the statistical hypothesis would require the use of a z-score.
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Bingo Hamburger Co has a chain of 12 stores in a large city. Sales figures and profits for the stores are given in the following table. Obtain a regression line for the data & predict profit for a store assuming sales of $10 million.
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What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
A random sample of 70 printers discovered that 20 of them were being used in small businesses. Find the 99% limit for the population proportion of printers that are used in small businesses.
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