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Test the significant difference between the two mean scores:
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. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of 24.9. Is this a significant difference at = .05? a) State the hypotheses for a right-tailed test.
b) Obtain a test statistic and p-value assuming equal variances. Interpret these results.
c) Is the difference in mean scores large enough to be important?
d) Is it reasonable to assume equal variances?
e) Carry out a format test for equal variances at = .05, showing all steps clearly.
In ANOVA, which of the following is not affected by whether or not the population means are equal?
Explain how many cars would required to go by the speed trap to be 99.8% sure which at least one driver will warm oncoming traffic of the speed trap.
What is the probability that in a sample of 10 pieces: 5 or more will be defective?
A school administrator randomly selects 12 classes from your school and then selects all of the students of those classes to study a school library issue. Which type of sampling design is being used.
Calculate the range, variance, and standard deviation for these sample data.
The 99% confidence interval estimate for a population variance when a sample standard deviation of 12 is obtained from a sample of 10 items is:
At the .05 significance level, can we conclude that the guideline is still reasonable?
Determine for each variable if it is the explanatory variable, the response variable, or whether it could be both.
Which measures of central tendency will always have but one (1) value for a set data?
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
Find a 95 percent confidence interval for the population mean concentration of uric acid in this patients blood. The concentration of uric acid in this patient's blood.
A game involving a pair of dice pays out $4 with probability 16/36, costs you $2 with probability 14/36, and costs you $6 with probability 6/36.
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