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An electrical firm manufactures electric light bulbs that have a length of life which is normally distributed with mean and standard deviation equal to 500 and 50 hours, respectively. Find the probability that a random sample of 15 bulbs will have an average life of less than 475 hours.
As sample size increases, the standard error of M _______________ .
Constructing a 95% confidence interval for the true length of time for all pepper seeds to germinate you must calculate the margin of error. The margin of error in this case is 0.60.
what is the probability of obtaining at least 6 cases in this class if the nationwide rate holds True?
A plus four 95% confidence interval for the difference between the two population proportions of wrist injuries is: A. 0.2909 ± 0.1674. B. 0.2909 ± 0.1069. C. 0.2909 ± 0.0907. D. 0.2909 ± 0.1275
Using alpha = 0.05 and a computed value of +4.49, can we conclude that the percentage of claims for married policyholders is less then for single policyholders?
What is the probability that the cereal would be high calorie? In other words, what is P (high calorie)?
If measurements are made over span of 9 months, and results are averaged, find out the probability that neighbourhood is considered unsafe?
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the decision rule.
What is the probability that the cereal would be high fiber? In other words, what is P (high fiber)?
Testing for equality of variances - Independent random samples were taken from normal distributions of the yearly production of ships built by the International Ship Building Company under
Taking α to be 0.05, what is/are the critical values associated with testing your hypothesis?
Explain the independent variable, covariate, and levels (groups) of eah. Also, explain the dependent variable and its associated measurement scale and expected outcome.
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