Which of the following is(are) TRUE?
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A: Mean = ? = 54.2 Standard deviation = ? = 12.3
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Q: 8. mean = 23.8; standard deviation = 5,2
A: Given data : Population Mean,μ = 23.8 Population Standard Deviation,σ = 5.2
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- The following information is available for two samples selected from independent normally distributed populations. Population A: n1=25 S21=36 Population B: n2=25 S22=9 a. Which sample variance do you place in the numerator of FSTAT? b. What is the value of FSTAT?In a survey of 180 females who recently completed high school, 75% were enrolled in college. In a survey of 160 males who recently completed high school,70 % were enrolled in college. At a=.009, can you reject the claim that there is no difference in the proportion of college enrollees between the two groups? Assume the random samples are independent. Complete parts (a) through (e).In a survey of 200 females who recently completed high school, 70% were enrolled in college. In a survey of 180 males who recently completed high school, 65% were enrolled in college. At α=0.09, can you reject the claim that there is no difference in the proportion of college enrollees between the two groups? Assume the random samples are independent. Complete parts (a) through (e).
- 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. 0.169 0.187 0.196 0.217 0.221 0.226 0.232 0.250 0.260 0.264 0.271 0.281 0.289 0.295 0.315 0.338 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.Consider that a random sample of size 12 was selected from a normal population distribution. 105.6 90.9 91.2 96.9 96.5 91.3 100.1 105.0 99.6 107.7 103.3 92.4 Do the data suggest that the population mean differs from 100? Use alpha = 0.05.In a fishing logde brochure, the lodge advertises that 75% of its guest catch northern pike over 20 pounds. Suppose that last summer 58 out of a random sample of 84 guests did, in fact, catch northen pike weighing over 20 pounds. Does this indicate that the population porportion of guests who catch pike is different from 75% (either higher or lower) ? Use alpha equal 0.05 A) state null and alternate hypotheses B) what sampling distribution will you use? C) What is the value of the sample test statistic? Round answer to 2 decimal places D) Find the P-Value to the test statistic? Round to 4 decimal places E) will you reject or fail to reject the null hypothesis? Are the data statistically significant at level apha?
- A travel agency is interested in finding out if different age groups frequent different Spring Break destinations, in order to better target the appropriate audiences. A random sample of college Spring Break vacationers produces the results given in the table below. Is there enough evidence at the 0.010.01 level of significance to show that there is a relationship between age (by college classification) and destination? Observed Sample of College Students Beach Mountains City Home Total Freshman 13 6 9 10 38 Sophomore 23 6 11 8 48 Junior 21 11 13 19 64 Senior 26 25 10 16 77 Total 83 48 43 53 227 Step 1 of 4: Calculate the expected value for the number of sophomores going to the mountains during Spring Break. Round your answer to six decimal places.Step 2 or 4: State the null hypothesis.Step 3 of 4: Compute the value of the test statistic. Round your answer to three decimal places, if necessary. (Note: If calculating by hand, be sure to use at least six…A company makes auto batteries. They claim that 81% of their LL70 batteries are good for 70 months or longer. Assume that this claim is true. Let p^ be the proportion in a random sample of 90 such batteries that are good for 70 months or more.