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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 mean crash damages the same for these three vehicles? State the decision rule for α = .05 and make the decision. Interpret the p-value.
Goliath Varmint Weasel
1,660 1,290 1,090
760 1,400 2,100
880 1,390 1,830
1,950 1,850 1,250
1,220 950 1,920
A company tracked the number of complaints it received during the first 6 months of last year, as shown in the following table:
How many participants would be required to ensure that a 95% confidence interval for the mean difference in the number of drinks is within two drinks of the true mean? Assumed that the standard deviation of the difference in the mean number of dri..
If he selects the three brands at random, what is the probability that he will select the following?
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
Discuss something you have witnessed or observed in nature. Discuss the temptation to imply or infer causality and be sure to identify areas of future investigation that might be warranted to determine cause and effect.
We are 95% confident that the proportion of non sell-able items for Whole Fruits is anywhere between 6.4% and 15.6% HIGHER than the proportion of non sell-able items for Green Grocer.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
A random sample of 41 basketball players from The Official NBA Basketball Encyclopedia gave the sample standard deviation for player height as s=3.32 inches.
Which of the examples below represent the Ratio level of scaling?
Does the data set represent a sample or a population? If it is a sample, describe the population from which it has been drawn.
Suppose also that after selecting 15 members at random we obtained the following paired observations: Use these data to find the covariance between age and the number of visits.
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