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In a time-use study, 20 randomly selected managers were found to spend a mean of 2.40 hours each day on paperwork. The standard deviation of the the 20 scores is 1.30. Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for the mean time spent on paperwork by all managers.
When coaching or training athletes, the tests employed to predict performance or determine training methods incorporate statistical methods. Why are these methods so effective?
206 randomly selected light bulbs were tested in a laboratory, 161 lasted more than 500 hours. Find a point estimate of the proportion of all light bulbs that last more than 500 hours.
Draw a ball from number 1: if red go to number 2; if black go to number 3. What is probability
From the following information for Alfred Industries compute the overhead spending variance and the volume variance:
Suppose there is no cyclical component. Quarterly billing for water usage is shown below describe summer billing for year 5.
Using α = .05 test for significance differences among the population mean wasted time for theses three urban areas. What is the p-value? What is your conclusion?
Some television stations attempt to gauge public opinions by posing a question on the air and asking viewers to call to give their opinions.
Did you find any outliers on the dependent variables that were due to errors of coding? If so, what and why? How would you correct an error of coding?
If she performs 15 demonstrations this week, what is the probability of her being satisfactory? What is the probability of between 4 and 8 (inclusive) orders?
You read a report that says, "On the basis of the simple random sample of 100 high school seniors that took the SATM test this year, a confidence interval for µ is found to be 512.00 ± 25.76." What was the confidence level used to calculate this..
We are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is:
A firm has tendered for two independent contracts. It estimates that it has probability 0.4 of obtaining contract A, and probability 0.1 of obtaining contract B. Find the probability that the firm:
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