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Compute a 90% confidence interval of the mean for a Weschler intellegence test with mean of 100.00 and standard deviation of 15.00 for a sample of 100 people. Use two decimal places.
Determine whether the description corresponds to an observational study or an experiment. Thirty university students are divided into two groups, one group receives free tutoring in mathematics, the other does not.
It was reported that 20 readers responded and 87% said "no" while 13% said "yes." Recognize 4 major flaws in this survey.
The participants in a television quiz show are picked from a large pool of applicants with approximately equal numbers of men and women.
Examine relationship between GNP per capita and the percentage of respondents willing to pay more taxes. Create a table using the data below for the GNP per capita and the percentage willing to pay higher taxes.
The following data from a sample of 100 families show the record of college attendance by fathers and their oldest sons: in 22 families, both father and son attended college; in 31 families, neither father nor son attended college; in 12 families,..
State the null and alternative hypotheses for the ANOVA (include definitions of parameters). What assumptions do we need to proceed with ANOVA?
Test whether there is significant difference in the test anxiety level of the three groups using nonparametric test.
Discuss why sampling is essential to many research designs, and why, if done correctly may be more accurate than attempting census measurement.
Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
A confidence interval increases in width as:
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
Using one proportion z test to find whether or not to support the claim - There is little evidence to reject H 0 , therefore they conclude the tvs are 20 pounds on average.
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