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Teach for America - Several programs attempt to address the shortage of qualified teachers by placing uncertified instructors in schools with acute needs-often inner cities. A 1999-2000 study compared students taught by certified teachers with others taught by under certified teachers in the same schools. Reading scores of the students of certified teachers averaged 35.62 points with standard deviation 9.31. The scores of students instructed by under certified teachers had mean 32.48points with standard deviation 9.43 points on the same test. There were 44 students in each group. The appropriate t procedure has 86 degrees of freedom. Is there evidence of lower scores with uncertified teachers? Discuss.
actual sales for january through april are shown below.month actual sales ajanuary 18february 25march 30april 40mayuse
What can we say about the form or way of the distribution of the average or median of the sample?
Student team examined parked cars in 4 different suburban shopping malls. One hundred vehicles were studied in each location. Research question : At α = . 05.
a researcher is trying to determine the temperature of lake erie within 1 mile of the shore. he measures the
polychlorinated biphenyls pcbs are used in the manufacture of electrical transformers and pose a great danger to health
What percentage of personal checking account customers carry average daily balances in excess of $800? What percentage of the banks customers carries average daily balances below of $200?
She wants to choose the passing grade such that the probability of passing a student who guesses on every question is less than 1/10. What score should she set as the lowest passing grade?
To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in.
p-value from tstat. a one-sample t statistic for h0 micro 0 based on n 16 is tstat 2.44.a how many degrees of
consider the following research eight hours of nightly sleep is not the health panacea you were brought up to believe
morens department store has a special sale whereby each customer upon checkout chooses a random ticket that is labeled
Let Z be a standard normal random variable. Calculate the following probabilities using the calculator provided. Round your responses to at least three decimal places.
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