42 68 (F) Round to the mean as needed Class Frequency, f Midpoint Relative frequency Cumulative frequency 17:27 18 22 0.05 18 28-38 42 ☐
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- The proportion of Americans who have frequent migraines is 15.2% according to the CDC. An acupuncturist claims that her treatment can reduce this figure significantly. A random sample of 594 Americans is administered the acupuncturists treatment and 71 report experiencing migraines. What is the sample proportion? (Round to 2 decimal places) ˆpp^=______The highway department is testing two types of reflecting paint for concrete bridge end pillars. The two kinds of paint are alike in every respect except that one is orange and the other is yellow. The orange paint is applied to 12 bridges, and the yellow paint is applied to 12 bridges. After a period of 1 year, reflectometer readings were made on all these bridge end pillars. (A higher reading means better visibility.) For the orange paint, the mean reflectometer reading was x1 = 9.4, with standard deviation s1 = 2.4. For the yellow paint the mean was x2 = 6.9, with standard deviation s2 = 2.2. Based on these data, can we conclude that the yellow paint has less visibility after 1 year? Use a 1% level of significance. What are we testing in this problem? single meandifference of proportions single proportiondifference of meanspaired difference (a) What is the level of significance?State the null and alternate hypotheses. H0: ?1 = ?2; H1: ?1 < ?2H0: ?1 = ?2; H1: ?1 ≠ ?2 H0:…The highway department is testing two types of reflecting paint for concrete bridge end pillars. The two kinds of paint are alike in every respect except that one is orange and the other is yellow. The orange paint is applied to 12 bridges, and the yellow paint is applied to 12 bridges. After a period of 1 year, reflectometer readings were made on all these bridge end pillars. (A higher reading means better visibility.) For the orange paint, the mean reflectometer reading was x1 = 9.4, with standard deviation s1 = 2.4. For the yellow paint the mean was x2 = 7.1, with standard deviation s2 = 2.0. Based on the data, can we conclude that the yellow paint has less visibility after 1 year? Use a 1% level of significance. 1) What is the value of the sample test statistic? (Test the difference ?1 − ?2. Round your answer to three decimal places.)
- The highway department is testing two types of reflecting paint for concrete bridge end pillars. The two kinds of paint are alike in every respect except that one is orange and the other is yellow. The orange paint is applied to 12 bridges, and the yellow paint is applied to 12 bridges. After a period of 1 year, reflectometer readings were made on all these bridge end pillars. (A higher reading means better visibility.) For the orange paint, the mean reflectometer reading was x1 = 9.4, with standard deviation s1 = 2.1. For the yellow paint the mean was x2 = 7.1, with standard deviation s2 = 2.4. Based on the data, can we conclude that the yellow paint has less visibility after 1 year? Use a 1% level of significance.What are we testing in this problem? single meanpaired difference difference of meanssingle proportiondifference of proportions What is the level of significance?State the null and alternate hypotheses. H0: ?1 ≠ ?2; H1: ?1 = ?2H0: ?1 ≥ ?2; H1: ?1 < ?2 H0: ?1 ≤ ?2;…What is the percentage of scores that lie between a z score of -2 and a z score of 1?Determine the probability of seeing a Z score of -5.28 or one with a larger absolute value.
- Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The area of the shaded region is (Round to four decimal places as needed.)The mean age of a class of twenty-five students is 23.8 years. How old would a twenty-sixth student have to be for the mean age of the class to be 24.0 years? yrFind the measures of center for following. DataFrequency50 - 54255 - 59060 - 64265 - 69670 - 74775 - 79880 - 841185 - 891690 - 9415 mode =87 median = mean = (round to 4 decimal places
- In a Ni-Cd battery, a fully charged cell is composed of nickelic hydroxide. Nickel is an element that has multiple oxidation states. Assume the following proportions of the states: Nickel Charge Proportions Found 0 0.17 +2 0.34 +3 0.33 +4 0.5-0.34 Determine the mean of the nickel charge. Please enter the answer to 2 decimal places.Which level of significance of Chi-Square would be significant, more significant, and not significant, and why? (.10, 01, .001)Which univariate graph for frequency would be reasonable to use to depict continuous data? Histogram or bar or pie chart
