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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 corresponding 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 statistical table, what is the approximate p-value for this test?
Construct and interpret the 95% confidence interval for the difference between the population means.
using a binomial table find the binomial probabilities px associated with given n ratio and x. a. n6 ratio 0.10 p4 b.
What conclusion is appropriate when He cannot be rejected and what conclusion is appropriate when He can be rejected - What is the p-value for the hypothesis test?
find and interpret the 98 confidence interval for the standard deviation of the time that it takes a telephone
For a random sample of 23 Asian countries, the variance on life expectancy was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in all of Asia?
The superintendent of a large office complex, upon evaluating 30 of the units recently purchased and finding their mean power consumption to be 805 watts, claims that her shipment does not meet company specifications. At the 0.05 level of signific..
a normally distributed quality characteristic is monitored throughuse of an x bar and r chart. these charts have the
a consumer group decides to test the effectiveness of a new organic laundry detergent. they intentionally get grass
Based on the information in (a), find a one-sided lower 90% confidence limit for m. Also, find a one-sided upper 90% confidence limit for m.
Suppose that observations X1, X2,..., Xn are made on a process at times 1, 2,..., n. On the basis of this data, we wish to test H0: the Xi 's constitute an independent and identically distributed sequence
A researcher has a series of Likert-scale items and a measure of frequency of absenteeism. He uses each of the Likert-scaled items in a separate bivariate correlation with absenteeism without testing for the assumptions of linear relationships. Is th..
The Water Authority informs Margaret that for a special fee of $6,000 this year, her farm will qualify for an additional allotment of 600 acre-feet of water. How should she respond?
discuss the importance of identifying an appropriate distribution of the quality characteristic in process capability
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