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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?
Suppose among 312 large city residents sampled, 65 refused to cooperate. What is the margin of error at the 95% confidence level.
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Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
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What is the probability that a visually impaired student gets less than 6.9 hours of sleep?
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
Which of the following measures only the strength of a relationship?
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
If there are 5 choices for a question and there is a 50% chance that the student knows the answer, what is the probability that the student knew the answer to a question he correctly answered?
Determine a 95 percent confidence interval for the population mean.
By using the 0.10 level of significance, is there evidence that the population mean is above the $300?
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