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For the following ANOVA table are the results from treating 4 cultures with 6 observations for each culture. The enzymes are contained in test tubes with differing levels of enzymes applied.
Please fill in the blank.
Source of Variation df SS MS F
Treatment 180
Error 60
Total
What are the null and alternate hypotheses?
What is your decision rule, Use α=0.05
Indicate your statistical decision.
Is there a difference among the means?
The amount of time the university professors devote to their jobs per week is normally distributed with a mean of 52 hours and a standard deviation of 6 hours.
What method is best suited for such a survey? Draw the sample using the random number table and bring out the rationale of the procedure.
Why is a normal distribution called "normal"? Investigate the answer to this question on the internet and share the answer in your own words. Be sure to cite your sources.
Determine the control limits for the mean and the range. Plot the control limits for the mean outside diameter and the range.
Identify and justify which type of sampling (random, stratified, systematic, cluster, convenience) is used in the following examples.
Does drug have significant effect on aggression? Use an alpha level of .05, two tails.
Determine the rejection region for the hypothesis Ho : mean D= 0 if H a : mean D > 0. Use a = 0.01. z>
Assume that a random variable, x, is distributed according to a normal distribution with mean 46 and standard deviation 12. (a) What is the standard error of the estimate, x-bar, if a sample of size 25 is taken?
Establish a 99% confidence interval for the difference in the proportion of suburban and urban housewives who own IPod.
The only difference is that the first group is comprised of athletic persons and the second of non-athletic ones.
Automobile manufacturers are interested in the difference in reaction times for drivers reacting to traditional incadescent lights and to LED lights.
Find the most powerful predictor among the six independent variables using regression.
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