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An educational researcher wants to know if the whole-language approach to teaching reading differs in effectiveness from more traditional approaches. She does a survey of NYC elementary schools and gets 83 responses. Of these, 36 schools reported using the whole-language (W) approach, and 47 used traditional methods (T). Of the 36 schools that used W, she determines that 12 had mean reading scores above the national median, while of the 47 that used T, 22 had mean reading scores above the national median.Perform the test (at the .05 level)
Display gender information in a chart and plot age data in a box plot - Calculate the appropriate measure of central tendency and variability for the age and gender. What conclusion can you draw from the data?
producers of pvc pipes want to have a supply of pipes sufficient to meet marketing needs. they wish to survey
This weekend the team has two games against teams they are not very familiar with. Assuming that the ?rst team they play is a class 1 team with probability 0.6 and the second is, independently of the class of the ?rst team, a class 1 team with ..
Explain (i) the hypotheses with a plausible definition of p or µ, (ii) whether or not the data indicate practical significance (use common sense and/or general knowledge), and (iii) whether or not the data indicate statistical significance.
The Red Cross honors and recognizes its best volunteers from time to time. One of the Red Cross offices has received 12 nominations for the next group of 4 volunteers to be recognized. Eight of these 12 nominated volunteers are female. If the Red ..
1. A zero-mean Gaussian random signal has the autocorrelation function of the form γX(τ) = 10e-0.1|τ| cos 2πτ. Write the covariance matrix for the signal sampled at four time instants separated by 0.5 seconds.
Now suppose 3 of his customers want the same ring, and they will go to another store if its already been sold. Would it be appropriate to use the binomial distribution under these conditions? Why or why not?
The new drug is administered to 300 patients with the condition. What is the probability that more than 265 will be relieved of nasal congestion?
Find an estimate of the observed tire weight for a tire diameter of 25.2 inches.- Find a 99% prediction interval for an observed tire weight if the tire diameter is 24.8 inches.
The firm for which you are working is growing. They have announced that they will open facilities in ten states. Calculate the mean, median, mode, variance, and standard deviation for both the sample and the population
Is there sufficient evidence at the 0.05 level of significance to conclude that the proportion of women physicians at the university health system exceeds 27.9%?
What is a nonparametric procedure? Describe specifically when you would utilize a nonparametric test. Under what conditions should you use the Wilcoxon sum rank test?
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