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A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n=25 third-grade children is selected to participate in the program and each child is given a standardized achievement test at the end of the year. For the regular population of third-grade children, scores on the test form a normal distribution with a mean of 150 and a standard deviation of 25. The mean for the sample of M=158
a. Identifiy the independent and dependent variables for this study.
b. Assuming a two-tailed test, state the null hypothesis in a sentence that includes the independent variable and the dependent variable
c. Using symbols, state the hypotheses (H0 and H1) for the two-tailed test.
d. Calculate the test statistic (z-score) for the sample.
e. What deccision should be made about the null hypothesis, and what decision should be made about the effect of the program.
While taking a multiple choice test, I realize I cannot answer the 5 questions without guessing. There are 5 choices for each question, A B C D or E.
Considering that the probability of event C is .44, of event D is .20, and the probability of their intersection is .088, determine whether C and D are dependent or independent events.
Consider the following two binomial experiments. In a binomial experiment consisting of six trials, how many outcomes have exactly one success and what are these outcomes?
What are some differences between discrete and continuous data? Is the measurement of money continuous or discrete? Explain. Can discrete data be analyzed using a normal distribution? Why or why not?
Women's heights are normally distributed with mean 63.6 and standard deviation of 2.5 in. A social organization for tall people has a requirement that women must be at least 70 in tall.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
A sample of 84 golfers showed that their average score on a particular golf course was 89.05 with a standard deviation of 3.47.
A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
Cores on two tests have a bivariate normal distribution; and that correlation of 2 scores is 0.8. Determine the probability that sum of the student's scores on 2 tests will be greater than 200?
Call centers typically have high turnover. The director of human resources for a large bank has compiled data on about 70 former employees at one of the bank's call centers in the Excel file Call Center Data.
In the Big Ten (the NCAA sports league) a sample showed that only 267 out of 584 freshmen football players graduated within 6 years. (a) At (alpha) a = .05
If the observed value is 4, the expected value is 5, and the standard error is 4, then the test value used for the z test is equal to
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