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Identifying H0and Hr in ex 5-12 , examine the given statement , then express the null hypothesis H0 and alternative hypothesis H1 in symbolic form.
1. The mean IQ of statistics students is at least 110.
2. The percentage of men who watch golf on tv is not 70%, as is claimed by the Madison Advertising Company.
Finding Critical Values. In Exercises 13-20 , find the critical z values. In each case ,assume that the normal distribution applies.
3. Two-tailed test: alpha = 0.01
4. Left-tailed test; alpha=0.05
Find out the marginal probability density function for the provided value. Assume that two random variables, X and Y, have bivariate pdf given by:
A manager at a local manufacturing company has been monitoring the output of one of the machines used to manufacture small aluminum plates.
Diastolic blood pressure (DBP) values were measured for 150 patients using two medical devices. The mean DBP values using the two devices are 120 and 122 respectively. Also the standard deviation of the difference of the measurements is 0.634. Te..
In order to determine whether or not a driver's education course improves the scores on a driving exam, a sample of six students were given the exam before and after taking the course. The results are shown below:
If the sum of squares regression is 1,000 and the sum of squares total is 5,000. Given that the sum of squares residual (or error) is 4,000 what is the r-squared value?
Analyze whether or not patients undergoing this treatment are illustrating significant change from baseline to 3 months afterward. Report a p-value.
Find the probability that the mean wieght of these 400 bags exceeds 16.6 ounces.
Construct a 95% confidence interval estimate for the mean yield of five-year certificates of deposit.
Develop a frequency distribution table with proportions. What is an experiment? Can you describe what a Group Frequency Distribution Table is and what it looks like?
Satellite Office Systems has vacancies for two executives that it will fill from among four women and six men. What is the probability that exactly one woman is selected?
Find out the test statistic P-value, and critical value, and state the final conclusion. The mean IQ score of statistic professors is less than 120. Sample data: n = 46. Suppose that = 17, and the significance level is = 0.05.
What is your conclusion? Are the two variables independent?
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