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A random sample of 77 eighth grade students' scores on a nation mathematics assessment test has a mean score of 278 with a standard deviation of 31. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 270. At infinity of .13, is there enough evidence to support the administrators claim? Find the standardized test statistic z and it corresponding area.
Carry out F test for significance of straight line regression of Y on X and interpret your results.
Construct a 90% two-sided confidence interval onthe difference between the proportion nonconforming in processes 1 and 2. Based on this confidence interval, can you conclude at a significance level of 10% that the difference is not equal to 10%? W..
What is the probability that at most five cases of E. coli per 100,000 are reported in California this year?
Discuss whether this variable should be placed in the model as an ordinary quantitative variable or by means of four 0, 1 indicator variables.
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be
In you determine the GPA of 10 members of the class and then calculate the average, will the number you get necessarily be the same as the average GPA for the whole class? On what factors would you expect the reliability of the estimate to depend..
An account invested in a money market fund grew from $73,329.23 to $73,627.26 in a month. What was the interest rate to the nearest tenth?
Using the z table in Table E of Appendix C, determine the critical value for the hightailed test with a = 0.035.
Calculate the Pearson correlation for these data also determine whether there is a significant correlation among attitudes for husbands also wives.
A soft drink bottling machine is set to dispense soft drink into containers labeled 16 ounces. While the actual quantities vary they are normally distributed with a mean of 16.1 ounces and a standard deviation of 0.015 ounces.
The ANOVA summary table below is the result of a regression of sales on year of sales. Is the relationship statistically significant at .05? Comment.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the decision rule.
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