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X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities:
A) p(z<78.0)
B) p(75.0<X<85.0)
C) p(x>86.0)
Use the definitional formula given below to find the derivative of the function.
How large a sample should be taken if the desired margin of error is?
Assume the likelihood that any flight on Northwest Airlines arrives within 15 minutes of the scheduled time is 0.90. We choose four flights from yesterday for study.
A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost.
Shown below are rental and leasing revenue ?gures for of?ce machinery and equipment in the United States over a seven-year period according to the U.S. Census Bureau. Use these data to run a linear regression and then forecast the rental and leasi..
Obtain a test statistic and p-value. Interpret the results at = .01.
Formulate the hypotheses that can be used to determine whether the mean of all account balances is significantly different from $1,150
A record executive is interested in the popularity of her label's newest band, The Standard Deviations. She asks 10 people how many Standard Deviations songs they know.
Suppose that 0.6 of the present 25,000 vehicle occupants killed in collisions were not wearing seat belts. There are about 170 million registered cars and trucks on the highway today.
would this prove that they are exceeding their goal, using α = .025?
At the 5% level of significance test whether the bottling process is carried out accurately or whether the filling machinery needs calibration. Use both the critical and the p-value approaches.
Write ten-step study plan with suitable example that will permit you to analyze your data.
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