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Learning a foreign language
Does delaying oral practice hinder learning a foreign language? Researchers randomly assigned 25 beginning students of Russian to begin speaking practice immediately and another 25 to delay speaking for 4 weeks. At the end of the semester both groups took a standard test of comprehension of spoken Russian. Suppose that in the population of all beginning students, the test scores for early speaking vary according to the N(32, 6) distribution and scores for delayed speaking have the N(29, 5) distribution.
(a) What is the sampling distribution of the mean score x in the early-speaking group in many repetitions of the experiment? What is the sampling
(b) The survey wants to compare men and women. What is the approximate distribution of the difference in the proportions who worked, pˆ M - pˆ F ? Explain the reasoning behind your answer.
(c) What is the probability that in the sample a higher proportion of women than men worked last summer?
Thirty-five percent of the democrats and 70% of the republicans favor the bill. the bill needs a simple majority to pass. using a probability tree, determine the probability that the bill will pass.
a turbine blade has demonstrated a weibull failure pattern with a decreasing failure rate characterized by a shape
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First, describe in your own words (no direct quotes, please) what a dummy variable is and its purpose in regression analysis. Secondly, provide an example of where you might use a dummy variable from your own professional experience.
Setup Null and Alternate hypotheses to test if average amount of soda in each can is less than 32 oz. Test the hypothesis using a = 0.05. What can you conclude from all this?
betsy is interested in predicting how many 75-year-olds will develop alzheimers disease and is using level of education
Addition Thermo on Probability - If a man is randomly selected for an interview, what is the chance he will Play football or basketball?
If appropriate, use the Tukey-Kramer multiple comparisons procedure to determine which file sizes significantly differ with respect to mean access read time. Test at the 95% confidence level.
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
to compare the effects on energy intake of drinking wine either before or with a meal 11 men participated in a
What proportion of a normal distribution is within one standard deviation of the mean?
1 assume that a radiologist group practice has the following cost structurefixed costsnbspnbspnbspnbsp
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