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The number of accidents to occur at a busy intersection during a 24 hour period has a Poisson distribution. If the probability of no accidents during a 24 hour period is 0.1353, what is the mean number of accidents per 24 hour period?
The mean of land and buildings per acre from a sample of farms was $637, with a standard deviation of 26. Use Empirical Rule to find approximate percentage of acreage whose values were between $ 661 and $663.
Test hypothesis that both propellants have same mean burning rate. Utilize α=0.05. Compute the P value.
Describe the following correlation. The students with the highest grades in written French were also the students with the highest grade in spoken French.
At 95% confidence using the p- value approach, test the hypotheses. Let α = 0.1.
What are the null and alternate hypotheses? How many treatments are there? What is the critical value of F at the 5% level of significance? Indicate in words when you would reject the null hypothesis.
Among the half that had surgery, 80% showed improvement after three months, but only 54% of those who used the wrist splints improved. what's the standard error of the difference in the two proportions?
Generate a relative frequency histogram using ten-point intervals to show the distribution of the scores.
Do the data indicate that the lengths of one supplier's 2x4's are subject to more variability than those of the other supplier? Assume α = 0.05. (HINT: F Test for Differences in Two Variances)
Suppose a survey item asks someone if something is very important, somewhat important, not very important, or unimportant. This is an example of what level of measurement?
Consider a random sample of six families who are asked if their children have an influence on their vacation destination.
Compute average daily rainfall in the week and for weekends. Get the average of weekdays' rainfalls and average of weekend's rainfalls.
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample standard deviation is 15. Conduct the following test of hypothesis using the .03 significance level.
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