a treatment is expected to increase scores among a population with µ= 20, then the alternative hypothesis is µwith treatment > 20. True or False
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- Suppose that samples of polythene bags from two manufacturers A and B are tested by a prospective buyer for bursting pressure, with the following results: If the prices are the same, which manufacture’s bags would be preferred by the buyer? Why?If our significant value falls below alpha, which is set at .05, we are over 95% confident that the results did not happen by chance. true or false?assuming an average estimate is 45 minutes for the procedure presented in the image, how do i state the null and alternative hypothesis? how would I calculate the test statistic? with an alpha of 0.05 what would be the critical value? using the critical method what can I conclude?
- You predict that a salesclerk at the mall will take longer to help a potential customer that is dressed in sloppy clothes vs a potential customer dressed in business attire. After running the study you find support for your hypothesis with the obtained value exceeding the critical value at the p < .05 level. Why wouldn't you want to say that you proved your hypothesis correct? What other sources might be a better explanation for your findings?What is null and alternative hypothesis for this case? The U.S. Department of Health monitors fishing waters, to determine if the bacteria count has risen above a maximum safe level of 70.The chi square statistics please answer and show work on solving x2 critical value and x2
- Explain why a high R-squared is not an indication that an estimated OLS coefficient β^1 from a model: y = β0 + β1x1 + ⋯ + βkxk + u is a causal estimate of the impact of x1 on y. What other factors are relevant to assess whether β^1 is a causal estimate?We want to use a z-test to determine if the mean is different from 10 at alpha = 0.05. Using the z-table, what is the critical value(s)?Average IQ scores for young school children are known to be 100 (SD = 15). However, the literature indicates that children’s intelligence may be decreased if their mothers have German measles during pregnancy. Using hospital records, a researcher obtained a sample of n = 25 school children whose mothers all had German measles during their pregnancies. Do the data indicate that children born to mothers who had German measles during the pregnancy have significantly lower IQ scores than typical young school children? child IQ scr 1 91 2 111 3 97 4 95 5 96 6 95 7 95 8 96 9 94 10 93 11 95 12 92 13 96 14 91 15 97 16 93 17 92 18 99 19 93 20 97 21 85 22 94 23 96 24 95 25 96 a. What is the independent variable in the research study? b. Is the independent variable categorical or quantitative? c. What is the dependent variable in…
- Average IQ scores for young school children are known to be 100 (SD = 15). However, the literature indicates that children’s intelligence may be decreased if their mothers have German measles during pregnancy. Using hospital records, a researcher obtained a sample of n = 25 school children whose mothers all had German measles during their pregnancies. Do the data indicate that children born to mothers who had German measles during the pregnancy have significantly lower IQ scores than typical young school children? child IQ scr 1 91 2 111 3 97 4 95 5 96 6 95 7 95 8 96 9 94 10 93 11 95 12 92 13 96 14 91 15 97 16 93 17 92 18 99 19 93 20 97 21 85 22 94 23 96 24 95 25 96 A. Is the dependent variable categorical or quantitative? A B. What is the mean IQ for the sample? B C. What is the sample standard deviation? C D. What…Let X1, ..., Xn be a sample from an exponential population with parameter λ.(a) Find the maximum likelihood estimator for λ. (b) Is the estimator unbiased?(c) Is the estimator consistent?You have conducted a series of experiments to reduce the proportion of scrapped battery cells to 1% in your manufacturing plant. What is the probabilty of testing 51 cells without finding a defect until the last cell?