If we're concerned with making estimates that are more often close to the true value, would we prefer a distribution with a large or small spread?
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If we're concerned with making estimates that are more often close to the true value, would we prefer a distribution with a large or small spread?
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- Suppose a sample of O-rings was obtained and the wall thickness (in inches) of each was recorded. Use a normal probability plot to assess whether the sample data could have come from a population that is normally distributed. Click here to view the table of critical values for normal probability plots. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Using the correlation coefficient of the normal probability plot, is it reasonable to conclude that the population is normally distributed? Select the correct choice below and fill in the answer boxes within your choice. (Round to three decimal places as needed.) O A. Yes. The correlation between the expected z-scores and the observed data, OB. No. The correlation between the expected z-scores and the observed data, O C. No. The correlation between the expected z-scores and the observed data, O D. Yes. The correlation between the expected z-scores and…Jacklyn created a sampling distribution that looks like a normal distribution. Her lead investigator recommended taking a larger sample. What would the new sampling distribution look like if Jacklyn increased the sample size? (choose the correct answer) -neither, they both will have the same shape -narrower (steeper) -becomes more positively skewed -wider (flatter)In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. Are America's top chief executive officers (CEOs) really worth all that money? One way to answer this question is to look at row B, the annual company percentage increase in revenue, versus row A, the CEO's annual percentage salary increase in that same company. Suppose a random sample of companies yielded the following data:
- II. Consider the data from two samples displayed in the two histograms: Sample A Sample B 30 30 25- 25 20 20 f 15 15 10 10- 5- 5. 10so 20 to 30 30 to 40 40 to 50 S0 to 00 60 to 0 oo s0 NO to 0 0so 100 10 to 20 20to 30 J0to 40 40 o 50 ta ete Determine if the following statements are a) TRUE or b) FALSE. In this Section Incorrect answers will be subtracted from correct answer (Do not guess)In the textbook, a sampling distribution can be regarded as approximately normal when which conditions are met?Patients with two kinds of diagnoses were randomly assigned to one of three types of therapy and the effectiveness of the therapy was measured on a 1-to-15 scale (with a higher number indicating greater effectiveness). There were two patients per cell. Use the data available below to complete parts through (d) below. Click the icon to view the data table. Click here to view page 1 of the table of cutoff values for the F distribution. Click here to view page 2 of the table of cutoff values for the F distribution. Click here to view page 3 of the table of cutoff values for the F distribution. Click here to view page 4 of the table of cutoff values for the F distribution. (a) Carry out the analysis of variance (use the 0.05 significance level). Complete the analysis of variance table for the data set below. SS MS Source Columns Rows Interaction Within Total (Round to two decimal places as needed.) df F Data Table Diagnosis Diagnosis II Therapy A 5 1 11 7 Print Therapy B 7 5 12 Done…
- After conducting a literacy test on inmates, the evaluator realizes that the test was much more difficult than expected. The shape of the distribution would be? (normal, positively skewed, negatively skewed, or bell-shaped?) How do I recognize which one it is?When the mean and median are equal, what can be said about the shape of the distribution? a. More information should be presented if assumptions pertaining to the shape of the distribution are to be made b. When the mean is equal to the median, the shape of the distribution tends to be slightly skewed right c. When the mean is equal to the median, the shape of the distribution can be assumed relatively symmetrical d. When the mean is equal to the median, the shape of the distribution tends to be slightly skewed leftRecent studies have shown that about 16% of American adults fit the medical definition of being obese. A large medical clinic would like to estimate what percentage of their patients are obese, so they take a random sample of 400 patients and find that 52 are obese. Suppose that in truth, the same percentage holds for the patients of the medical clinic as for the general population, 16%. Find the mean of the sampling distribution of p̂.
- Patients with two kinds of diagnoses were randomly assigned to one of three types of therapy and the effectiveness of the therapy was measure a 1-to-15 scale (with a higher number indicating greater effectiveness). There were two patients per cell. Use the data available below to comple parts (a) through (d) below. Click the icon to view the data table. Click here to view page 1 of the table of cutoff values for the F distribution. Click here to view page 2 of the table of cutoff values for the F distribution. Click here to view page 3 of the table of cutoff values for the F distribution. Click here to view page 4 of the table of cutoff values for the F distribution (a) Carry out the analysis of variance (use the 0.05 significance level). Complete the analysis of variance table for the data set below. SS MS F Source Columns Rows Interaction Within Total (Round to two decimal places as needed.) Data Table Diagnosis I Diagnosis II Therapy A 5 1 7 Print Therapy B 7 12 Done Therapy C 4282…In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. Are America's top chief executive officers (CEOs) really worth all that money? One way to answer this question is to look at row B, the annual company percentage increase in revenue, versus row A, the CEO's annual percentage salary increase in that same company. Suppose a random sample of companies yielded the following data: B: Percent increasefor company 24 25 25 18 6 4 21 37 A: Percent increasefor CEO 21 25 22 14 −4 19 15 30 Do these data indicate that the population mean percentage increase in corporate revenue (row B) is different from the population mean percentage increase in CEO salary? Use a 5% level of significance. (Let d = B − A.)…Can you please explain to me a good example of what the mean of sampling distribution is?
