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A study in pediatric emergency care compared the injury severity between younger and older children. One measure reported was the Injury Severity Score (ISS). The standard deviation if ISS score for 37 children 8 years or younger was 23.9, and the standard deviation for 36 children older than 8 years was 6.8. Assume that ISS scores are normally distributed for both age groups. At the 0.01 level of significance, is there sufficient reason to conclude that the standard deviation of ISS scores for younger children is larger than the standard deviation of ISS scores for older children?
74 cashews, and 45 pecans. At the 0.05 level of significance, conduct a nonparametric test that the machine is mixing nuts in the ratio 5:2:2:1.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year.
Determine x-bar and s for this data set. You may suppose the values for bulb life are normally distributed. Use traditional method to make your decision.
Find the minimum sample size required to estimate the percentage of college students who use loans to pay for college.
The data collected was for each car for each type of fuel. Performance was measured in miles per gallon. Perform an ANOVA test and state the results.
Generate a training sample of size 100 for each class, as well as a test sample of 5,000 per class. (Best to generate the centroids matrices per class once and store them).
Suppose that the National Labor Relations Board (NLRB) wishes to estimate the average hourly wage rate for a certain classification of skilled workers. It wishes to be 95% certain to get an estimate of sample mean within 0.05 of the truth.
Considering all of the day to day activities you are engaged in at work and in your personal lives, write a 200 (or more) word paper that describes at least three (3) different statistical usages that you see regularly.
Based on the information about typical use, what is the probability that at least 25 of these women become pregnant in the next year? Is the Normal approximation permissible?
What type of solution do you get for a quadratic equation where D
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