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In a study to investigate the effect of the color paper (blue, green, orange) on response rates for questionnaires distributed by the "windshield method" in supermarket parking lots, four supermarket parking lots were chosen in a metropolitan area and 10 questionnaires of each color were assigned at random to cars in the parking lots.
a. Is this study experimental, observational, or mixed? Why?
b. Identify all factors, factor levels, and factor-level combinations.
c. What type of study design is being implemented here? Completely randomized, randomized complete block, nested designs, repeated measures? explain
d. What is the basic unit of study?
A sample of 16 patients in a doctors office showed that they had to wait an average of 43 minutes with a standard deviation of 8 minutes before they could see doctor. Provide a 99% confidence interval for the average waiting time for all of the pa..
Under new grading scale, how many students will have A's, B's, C's, D's and F's? Do you beleive the instructor must grade on a curve? Explain why or why not?
Compute the sample variance and sample standard deviation as a measure of volatility of monthly total return for Chevron (to 2 decimals): Sample variance and Sample standard deviation.
The mean life time of the sample of 160 tires will be less than 39,000 miles? Interpret the probability in terms of the truth of the manufacturer's claim.
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months. What is the probability that a randomly selected terminal will last more than 5 years?
With a single-sample t ratio, the null hypothesis states that:
warren buffy is an enormously wealthy investor who has built his fortune through his legendary investing acumen. he
What is the probability that the second one selected is defective given that the first one was defective? (c) What is the probability that both are defective?
510 people were asked which of four fast food restaurant were their favorite. Determine if there is a preference for any one place over any other.
Following data on x=weight (in pounds): x 1 33.5, x2 27.3, x3 36.7, x4 30.5 Suppose that one more piece is selected; denote its weight by x5. Find a value of x5 such that X = smaple median.
What is approximately the largest sample mean of another sample of n= 16 participants you would expect to obtain from this finite population?
Would the method described above be a good way to determine which team was taller (explain why or why not)?
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