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The amount of time university professors devote to their jobs per week is normally distributed with a mean of 52 hours and a standard deviation of 6 hours.
1. What is the probability that a professor selected at random works for more than 52 hours per week?
2. Suppose that we select five professors at random. What is the probability that exactly two of them work more than 52 hours per week?
The 90% confidence interval to estimate the true average difference in nationwide sales quantity before the ad campaign and after is (0.39, 16.64). Which of the following is the appropriate conclusion? The differences were calculated as (after ad ..
a single strain gage has a nominal resistance of 120 ohm. for a quarter bridge with 120 ohm fixed resistors the voltage
Suppose that in a random sample of 230 hockey players, 19 of them indicated that they are left-handed. Find the 97% Wilson estimate (plus four) confidence interval for the proportion of all hockey players that are left-handed.
What is the optimal solution if the annual return for U.S. Oil changes from $3 to $8 per share (everything else stays the same)? What is the value of the total return?
Do these data lend support to this belief? Perform a significance test to answer this question. Construct and interpret a 95% confidence interval for the difference in proportions.
Airlines monitor the causes of flights arriving late. 75% of flights are late because of weather, 35% of flights are late because of ground operations. 10% of flights are late because of weather and ground operations.
according to most estimates 10 of the people in the general population are left-handed and 90 are right-handed. a
As part of a study,investigators wanted to assess the accuracy of self reported smoking status. Participants are asked whether they currently smoke or not. In addition, laboratory tests are performed on hair samples to determine presence or absence o..
Determine the event that the sum of the numbers falling uppermost is less than or equal to 7
Determine the 95 percent confidence interval and the 95 percent prediction interval for the selling price of a home with 2,200 square feet.
The answer was finding the length and width of a rectangle. The results were x= 3 and x= -4. Neither the length or width can be a negative number. However, 3 did work in the original equation."
At least half the patients are under 15 years old? First, describe how this can be modelled as a binomial distribution with 8 trials, where success is visitor age is under 15 years old and the probability of success is 20 percent.
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