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Question: Significant again? A new reading program may reduce the number of elementary school students who read below grade level. The company that developed this program supplied materials and teacher training for a large-scale test involving nearly 8500 children in several different school districts. Statistical analysis of the results showed that the percentage of students who did not meet the grade-level goal was reduced from 15.9% to 15.1%. The hypothesis that the new reading program produced no improvement was rejected with a P-value of 0.023.
a) Explain what the P-value means in this context.
b) Even though this reading method has been shown to be significantly better, why might you not recommend that your local school adopt it?
Burning calories with exercise. Table 28.13 provides data on speed and calories burned per hour for a 175- pound male using two different treadmills (a Cybex and a LifeFitness) at inclines of 0%, 2%, and 4%
question eighteen per cent of multinational companies provide an allowance for personal long-distance calls for
the city transit authority plans to hire 12 new bus drivers. from a group of 100 qualified applicants of whom 65 are
From past studies, they believe that this proportion will be about 0.15. Find the sample size needed if the margin of error of the confidence interval is to be no more than 0.02.
Find the sample space for the number of outcomes (you don't need to list the possible outcomes, just how many possible outcomes there are).
assume that 2 out of every 1000 people have a particular disease. a test has been developed to detect this disease.
Make a scatter diagram of the scores; (b) describe in words the general pattern of correlation, if any (c) figure the correlation coefficient; (d) figure whether the correlation is statistically significant.
What is the critical F value for a sample of 21 observations in the numerator and 15 in the denominator? Use a two-tailed test and the 0.02 significance level. (Round your answer to 2 decimal places.)
Eexperiment begins the instant after the zeroth car goes by. Determine, in as simple form as possible, expressions for the probability that?
scores on a national exam assume a normal distribution with a population mean of 50 and population standard deviation
The random variable X has the cumulative distribution function F(x) whose value or derivative F(x) is shown below for various values of x.
What is the subpopulation mean when x = 7?- Between what two values would approximately 95% of the observed responses y fall when x = 7?
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