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Calculate the degrees of freedom for the test of equality of population means of two samples.
Two independent samples of sizes 16 and 26 were taken. In a test of equality of population means of the two samples, how many degrees of freedom are associated with the critical t-value?
(1) 44
(2) 41
(3) 43
(4) 40
(5) 42
A process has a capability index of 0.40. This index is interpreted to mean that the process is:
What is the null and alternative hypothesis? What is your final conclusion?
What is the rejection point at α = .10 and indicate if you would accept or reject H o ?
As we can say there is 5.5 percent chance of seeing the current policy having an effect on smog in the results we observed from natural sampling variation.
would this prove that they are exceeding their goal, using α = 0.025?
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
By using significance level a = .05, and suppose a normal distribution what does evidence conclude?
What is the expected number of Republicans who will win office in the coming election?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group, (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each class.
Use relative frequencies to estimate the probability that a seed will germinate, What is your estimate?
Is this enough evidence to support Union's position? Use significance level of a = 0.05. You may suppose the mean annual salaries are normally distributed.
Based on your answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
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