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A random sample of 10 observations from one population revealed a sample mean of 23 and a sample deviation of 4. A random sample of 8 observations from another population revealed a sample mean of 26 and a sample standard deviation of 5. At the .05 significance level, is there a difference between the population means.
(a) Compute the pooled estimate of the population variance.
(b) Compute the test statistic.
(c) State the decision about the null hypothesis.
(d) Estimate the p-value.
Pepsi wanted to test to determine if the males preferred Pepsi more than the females. (a) PConduct the appropriate test and describe the results (ick your own alpha value)
Generate a 95% confidence interval for the true mean total cholesterol levels in children.
In a bag there are 20 marbles. The colors of the marbles are as follows: red - 5; blue - 8; green - 3; yellow - 4.
The amount of time a bank teller spends with each customer has a population mean = 3.1 minutes and population standard deviation = 0.4 minute.
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
Evaluate probabilities using the laws of probability, the standard normal distribution, t-distribution, or X2-distribution.
A bonding company want to insure a construction projects completion. If the project is cancelled due to the contractor's lack of performance
Make sure you include a complete ANOVA summary table. Also, report the appropriate null and research hypotheses and the critical value (alpha = 0.05).
Is it reasonable typical worker does not miss any days during a pay period?
Describe what do you mean by conditional probability. Give clinical example to support the explanation.
Consider the formula used for any confidence interval and the elements included in that formula. What happens to the confidence interval if you (a) increase the confidence level, (b) increase the sample size, or (c) increase the original sample st..
When calculating correlation coefficient, what does a value of -2 indicate? Strong negative correlation, Weak negative correlation.
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