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1. Find the probability that a standard normal random variable will assume a value between:
a. z = 1.5 and z = .75
b. Greater than 1.25
c. Find a z such that 70% of the area is above that value.
2. In recent years, the use of the telephone as a data collection instrument for opinion polls has been steadily increasing. However, one of the major factors affecting the extent to which the telephone can be used is the refusal rate that is, the percentage of eligible subjects actually contacted who refuse to take part in the poll. Suppose that past records indicate a refusal rate of 20% in a large city. What is the probability that out of 15 people:
a. No one refuses to take part in the poll?
b. Exactly 2 refuse to take part in the poll?
c. At most three refuse to take part in the poll?
d. What is the mean and standard deviation of those who refuse to take part in the poll?
Determine which groups differ in average shelf life. Give test statistic, hypothesis, decision rule and hypothesis
An advisory group decided to investigate this claim, believing it was too large. A sample of 200 traffic accidents this year showed 74 persons were also involved in another accident within the last five years. Use the 0.01 significance level. Show..
What should the cut-off score be for the interviews? (Round to nearest whole number).
Indicate at which point flat-of-the-curve medicine is experienced in the following example (imagine that antibiotics have been prescribed for a given population of 1,000 elderly persons).
Based on these data, determine the 95 percent confidence interval estimate for true population mean?
The manager of a local gymnasium has determined that the length of time patron spend at the gymnasium is normal distributed with mean 80minutes and standard deviation 20 minutes. What is the patrons who spend more than 120 minutes at the gymnasium..
In optimal solution, determinethe critical path?
Let S be a random variable (not necessarily positive). Prove using Markov's inequality that for every p>0 and for every constant q,
Based on these data, what is the probability that next Christmas will be dry and based on the data,what is the probability that next Christmas will be rainy or cloudy and dry?
Pizza House offers 4 different salads, 5 different kinds of pizza, and 4 different desserts. How many different three course meals can be ordered?
Find the test statistic value for two mean tests in large sample.
Data from a National Health Survey show that men's average weight is normally distributed with a mean of 172 pounds and a standard deviation of 29 pounds.
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