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The average length of a long distance telephone call is 28 minutes with a standard deviation of five minuts. assuming the call times are normally distributed, what percentage of calls are longer than 35 minutes.
This is an Excel sheet that calculates both probabilities and percentiles for any normal or standard normal probability distribution. Replaces normal probability tables.
You are conducting a study for which it is critical that the findings be representative of the population of interest. Which of the following research methods runs the greatest risk.
Given the following information about a hypothesis test of the difference between 2 means based on independent random samples, what is the correct rejection region at a significance level of .05?
A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
The Acme School of Locksmithing has been accredited for the past 15 years. Discuss how this information might be interpreted as a
Standard deviation of 4 beats per minute. If 300 women are examined, how many would you expect to have a heart rate less than 75?
Data in table represent number of consumer complaints against major U.S. airlines. If one complaint from table is arbitrarily chosen, determine the probability that it was filed against United Airlines.
A client has an investment portfolio with mean value is equal to 4500 USD, with a standard deviation of 300 USD. What is the probability that the value of her portfolio is between 3900 USD AND 5400 USD?
The average monthly cot for a studio apartment in NYC is reported to be $1,000. You want to prove that average monthly rent is not what is stated.
Another location if it meant a substantial promotion. Based on these findings, write a brief note to management regarding all executives in the firm.
Intersection of two mutually exclusive events: can be any value between 0 to 1, must always be equal to 1.
what sample size should be used in the funding decision study? Use σ = $4000 as a planning value. ________________
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