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Different methods of teaching reading
In the READING data set, described in the Data Appendix, the response variable Post 3 is to be compared for three methods of teaching reading. The Basal method is the standard, or control, method, and the two new methods are DRTA and Strat. We can use the methods of this chapter to compare Basal with DRTA and Basal with Strat. Note that to make comparisons among three treatments it is more appropriate to use the procedures that we will learn in Chapter 12.
(a) Is the mean reading score with the DRTA method higher than that for the Basal method? Perform an analysis to answer this question, and summarize your results.
(b) Answer part (a) for the Strat method in place of DRTA.
an automobile manufacturer obtains the microprocessors used to regulate fuel consumption in its automobiles from three
A company is filling bags of rock salt to a level of 50 pounds. It believes that all bags are filled correctly, but would like to use a hypothesis test with an alpha of 0.05 to check this belief.
Suppose that the null hypothesis is rejected and alternate hypothesis is accepted. Discuss the conclusion as a Type I error, a Type II error, or a correct decision, if in fact the defendant is innocent.
Sstandart deviation of 40 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 368 seconds.
Uuse a level of significance of a =0.01 to test to see if you have sufficient evidence to support the claim that the defective rate exceeds 3%.
What proportion of corks produced by this machine are defective - The specifications call for corks with diameters between 1.9 and 2.1 cm. A cork not meeting the specifications is considered defective.
A local health care company wants to estimate the mean weekly elder day care cost. A sample of 10 facilities shows a mean of $250 per week with a standard deviation of $25. What is the 90 percent confidence interval for the population mean?
At significance level of 0.02, is this sample evidence consistent with a hypothesis that 10% or fewer of all dollar bills have anything written on them besides the normal printing?
Data on the magnitudes of earthquakes near Fiji are available on the website for this book. Estimate the cdf F(x). Compute and plot a 95 percent con?dence envelope for F (as described in the appendix).
One-way random effects model : yi j = + i + i j , i j "s are independent error terms with N(0, 2 ), i are independent N(0, 2 ), And i and i j are independent Why?
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Show all the steps of your hypothesis test including a) the claim being tested , b) the null and alternative hypothesis, c) the test statistic, d) the p value, e) initial conclusion, and f) a final conclusion about the original claim.
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