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Using Table E.6, determine the lower-and upper-tail critical values for the Wilcoxon rank sum test statistic,
d. Given the results in (a) through (c), what do you conclude regarding the width of the region of nonrejection as the selection level of signification,
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Chapter 12 Solutions
Basic Business Statistics, Student Value Edition
- A medical researcher is interested in determining if there is a relationship between adults over 50 who exercise regularly and levels of blood pressure. A random sample of 236 adults over 50 is selected and the results are given below. Calculate the test statistic to test the claim that regular exercise and blood pressure are independent. Use α = 0.01.arrow_forwardTwo researchers conduct separate studies to test Ho: p=0.50 against Ha: p0.50, each with n = 400. Researcher A gets 226 observations in the category of interest, and p= 6=226/400=0.565. Researcher B gets 225 in the category of interest, and p = 225/400=0.5625. Complete parts (a) through (d) below. a. Find the z-scores and P-values for both researchers. Researcher A Z = Researcher B Z = P-value = P-value = (Round the z-scores to two decimal places as needed. Round the P-values to three decimal places as needed.) The result in case A is The result in case B is b. Using α = 0.01, indicate in each case whether the result is "statistically significant." Interpret. What does the statistical significance of the results above imply? OA. A difference in conclusions between two hypothesis tests does not necessarily mean that the test with the result that is deemed "statistically significant" is actually much more significant than the test with the result that is deemed "not statistically…arrow_forwardA sample of n=25 scores has a mean of M=68. Find the z-score for this sample: if it was obtained from a population with u=60 and 0=10arrow_forward
- Researchers determine that 60 puffs tissues are the average number of tissues used during a cold. suppose a random sample of 100 puffs users yielded the following data on the number of tissues used during a cold: x̅=52 and s=22. Using the sample information provided, the value of the test statistic is?arrow_forwardThe article "Behavioural Effects of Mobile Telephone Use During Simulated Driving"t reported that for a sample of 20 experimental subjects, the sample correlation coefficient for x = age and y = time since the subject had acquired a driving license (yr) vas 0.97. Why do you think the value of r is so close to 1? (The article's authors give an explanation.) O The younger a subject is, the more time since they acquired their license. O The older a subject is, the less time since they acquired their license. O The older a subject is, the more time since they acquired their license. O This is a mistake. The value should be close to -1. O This is a mistake. The value should be close to 0.arrow_forwardA sample of n=25 scores has a mean of M=68. Find the z-scores for this sample: if it was obtained from a population with u=60 and o=40arrow_forward
- A study was conducted to compare three methods of measuring concentration of certain type of chemical pollutants in a lake. The data is given in Table 1 below. Compute SS(between) and SS(within). Compute SS(total), and explain the relationship between SS(between), SS(within), and SS(total). Compute MS(between), MS(within), and F statistic. Based on your computations, are there significant differences in the mean pollutant concentrations among the three methods? Table 1. Amount of concentration of a chemical pollutant in a lake using three different measuring methods Method 1 Method 2 Method 3 10.96 10.88 10.73 10.77 10.75 10.79 10.90 10.80 10.78 10.69 10.81 10.82 10.87 10.70 10.88 10.6 10.82 10.81 Monoamine oxidase (MAO) is an enzyme that is thought to play a role in the regulation of behavior. To see whether different categories of patients with schizophrenia have different levels of MAO activity, researchers collected…arrow_forwardA study was conducted to compare three methods of measuring concentration of certain type of chemical pollutants in a lake. The data is given in Table 1 below. Compute SS(between) and SS(within). Compute SS(total), and explain the relationship between SS(between), SS(within), and SS(total). Compute MS(between), MS(within), and F statistic. Based on your computations, are there significant differences in the mean pollutant concentrations among the three methods?Table 1. Amount of concentration of a chemical pollutant in a lake using three different measuring methods Method 1 Method 2 Method 3 10.96 10.88 10.73 10.77 10.75 10.79 10.90 10.80 10.78 10.69 10.81 10.82 10.87 10.70 10.88 10.6 10.82 10.81arrow_forwardUse the table of critical values of the Pearson correlation coefficient to determine whether the correlation coefficient is statistically significant at the specified level of significance for the given sample size. Write the critical value to the nearest thousandth. r=0.998r=0.998, α=0.01α=0.01, n=4 Is the correlation coefficient statistically significant?arrow_forward
Calculus For The Life SciencesCalculusISBN:9780321964038Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.Publisher:Pearson Addison Wesley,
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