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1. Two machines are supposed to be producing steel bars of approximately the same length. A sample of 35 bars from one machine has an average length of 37.013 inches, with a standard deviation of 0.095 inches. For 38 bars produced by the other machine, the correspond- ing figures are 36.974 inches and 0.032 inches. Using the 0.05 level of significance, test the null hypothesis that the population means are equal. Using the appropriate statis- tical table, what is the approximate p-value for this test? Construct and interpret the 95% confidence interval for the difference between the population means.
2. Observing a sample of 35 morning customers at a convenience store, a researcher finds their average stay in the store is 3.0 minutes, with a standard deviation of 0.9 minutes. For a sample of 43 afternoon customers, the mean and standard deviation were 3.5 and 1.8 minutes, respectively. Using the 0.05 level of significance, determine whether the population means could be equal. Construct and interpret the 95% confidence interval for the difference between the population means.
The random variable x has a normal distribution with mean=30 and standard deviation = 30. Find the probability that x assumes a value more than two standard deviations from its mean more than three standard deviations from the mean.
What is the probability that more than 25% of the business travelers say that the reason for their most recent business trip was an internal company visit?
Calculate the standard deviation of the number of available rooms in that sample. Construct a frequency distribution of the sample mean, and plot a histogram of this distribution.
computing the mean standard deviation values for the given data.1. choose the most appropriate and precise type of
Ms. Tina Stevens just purchased a new dress that cost $120. What is the probability she paid cash or check? (Round your answer to 3 decimal places.)
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might be less practical than some other sampling methods.
there are ten balls in an urn. they are identical except for color. five are red four are blue and one is yellow. you
in a study to estimate the proportion of residents in a city that support the construction of a new bypass road in the
sixty percent of college students weigh between 150-210 lb.identify degree of confidence level of confidence
If the selected worker found a job with a new company in the same field, what is the probability that the worker is a union member?
what additional information is obtained from measurements on an interval scale compared to measurements on an ordinal
Determine the standard error of estimate. Suppose a large sample is selected (instead of just five). About 68 percent of the predictions would be between what two values?
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