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The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones, is the effect on accident rates. Is someone who is using a cellular phone more likely to be involved in a traffic accident? What is your conclusion from the following sample information? Use the .05 significance level.
Is the gender distribution for theater goers significantly different from the distribution for the general college? Test at the .05 level of significance.
Consider the many possible distributions of grades on a quiz in a statistics class; imagine that the grades could range from 0 to 100.
For the set of data below construct a grouped frequency distribution that as well contains the real limits of each interval, midpoint of each interval, the cumulative frequency,
If 900 users visited the site, would the probability that more than 250 of them click on an ad be higher or lower than the answer found in part
One advantage of the repeated measures ANOVA is that it eliminates "individual differences" as a source of variability. Explain why there are no individual differences in the numerator and in the denominator of the F ratio.
We are interested in determining if the accident proportions differ between the two age groups:
The level of various substances in the blood of kidney dialysis patients is of concern because kidney failure and dialysis can lead to nutritional problems.
The GMAT scores from a sample of 50 applicants to an MBA program indicate that none of the applicants scored below 450. A frequency distribution was formed by choosing class intervals 450 to 499, 500 to 549, and so on, with the last class having a..
Hanna Properties specializes in custom-home resales in the Equestrian Estates, an exclusive subdivision in Phoenix, Arizona. A random sample of nine custom homes currently listed for sale provided the following information on size and price.
Develop a 99% confidence interval for the population mean household income, assuming a normal distribution.
Given that the student you choose is a senior, find out the probability of selecting a non-senior?
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
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