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1. Listed below are intervals (in minutes) between eruptions of the Old Faithful geyser in Yellowstone National Park. After each eruption, the National Park Service probides an estimate of the length of time to the next eruption. From the sample data below, find the mean and standard deviation for the time between eruptions.
98, 92, 95, 87, 96, 90, 65, 92, 95, 93, 98, 94
2. Stanford Binet IQ scores have a mean of 100 and a standard deviation of 15. Albert Einstein reportedly had an IQ of 160. Convert Einstein's IQ score to a z score.
Graph the distribution using a histogram. Calculate the mean and standard deviation.
At.05 significance level is it reasonable to conclude that it takes longer to determination software issues? Determine the p-value?
About what percent of the observations lie between 55 and 65?
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the ..
Once again, suppose that the standard deviation of the average or median is $5.00. Which is the probability that the average or median of the sample is greater than $22.50 but less than $25.00?
Determine margin of error for confidence interval in (a)?
Follow the conventions as described in the general guidelines for writing up Special Problems.
The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
If statistically significant, do you think the difference is large enough to be important?
Plan the scatter diagram
Use the study to estimate the risk of an air bag fatality on a child seated on the front passenger seat.
As it is a 2 _ 2 table, try also two-tailed two-sample z test for ð1 = ð2 and verify that z2 is same as your chi-square statistic. Which test do you favour? Describe why?
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