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To find the possibility using the normal distribution. The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally distributed with a standard deviation of 0.2 sec. If you select a random sample of 30 download times.
a) What is the probability that the sample mean is less than 0.75 second?
b) What is the probability that the sample mean is between 0.70 and 0.90 sec?
c) The probability is 80 percent that the sample mean is between what two alues, symmetrically distributed around the population mean?
d) The probability is 90 percent that the sample mean is less than what value?
Make for more scatter plots comparing GDP growth 1970-2000 to corruption, political rights, rule of law, and socio-political instability
How many subjects would you approximately need to reduce the length of the 95% confidence interval to 2 units?
Difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
Compute the probability that debt for a randomly selected borrower with good credit is more than $18,000?
Determine the 95% confidence interval for your estimate what data have you utilized as the basis of your predictions what suppositions have you made.
A fair coin was flipped three times and landed heads three times. What is the probability of a head on the next toss?
Hours worked is important predictor of amount of sales.
How variable is the number of service calls with which Sam's department must deal?
Determine the values of mean M and standard deviation s for original sample?
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.
Find out the correlation among the two variables in the regression. A simple linear regression produced the following computer output.
The Wilcoxon signed rank test is computed for the data and gives a value W + = 161.5. Using the Normal approximation (without the continuity correction) the P-value.
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