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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.
Give critical test statistic and compute sample test statistic. Test null hypothesis at alpha level .01.
At.01 significance level is it sensible to conclude that modification decreased the number of traffic accidents?
What is the 99% confidence interval?
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
A population whose shape is unknown has a median of 75. You selected a sample of 40. The standard deviation of the median is 5. Calculate the probability that the median of the sample or average medians is:
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
Assuming the population is large, which sample size will give the smallest standard deviation to the statistic and select the numbers for the first five to be interviewed.
Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other two years are each given a weight of 1.
Which statement is true for a statistical study?
What is the probability that: The amount requested is $80,000 or more?
Determine the following probabilities: Events A and B are mutually exclusive events defined on common sample space.
What is the p-value associated with the sample results? What is your conclusion based on the p- value?
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