ces of a random sample of 25 oranges harvested at Sunny Day Orchards this season. 12.6 10.0 11.4 13.6 12.8 8.0 9.7 10.1 9.5 7.1 9.0 9.3 6.5 15.9 7.4 14.1 5.1 8.8 4.9 8.1 10.8 7.5 4.6 10.1 10.2 Interpret the confidence interval in the context of the problem. tights in
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- Subject:A random sample of commute times in minutes is given below. Assume the population of commuters is normally distributed. Minutes 49 20 15 20 23 50 31 45 41 30 27 35 1. Construct the 95% confidence interval for the mean commute time. [ Select ] 2. What is the point estimate for mean commute times? [ Select ]Q6
- Two groups were selected for an experiment. The sample data is reported: Group A Group B Sample Mean Spending/day ($) 170 150 Sample Standard deviation ($) 10 5 # of Females 9 7 Sample Size 36 42 a. Set up a 99% confidence interval for the mean difference in spending between the two groups. b. At the 10% level test the alternate hypothesis that group B has lower spending level than Group A.6 squirrels were found to have an average weight of 760 grams with a sample standard deviation of 6.6. Find the 95% confidence interval of the true mean weight (assume the t-student distribution). O (717.46, 763.12) O (753.07, 766.93) O (757.17, 765.03) O (677.76, 763.12)不 A study was done using a treatment group and a placebo group. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level for both parts. EZCH H n X S b. Construct a confidence interval suitable for testing the claim that the two samples are from populations with the same mean.13 5%, 1 of 57 pts A college entrance exam company determined that a score of 21 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 150 students who completed this core set of courses results in a mean math score of 21.4 on the college entrance exam with a standard deviation of 3.2. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 21 on the math portion of the exam? Complete parts a) through d) below. Question Help ▼ Click the icon to view the table of critical t-values. a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are Ho: versus H,: Enter your answer in the edit fields and then click Check Answer. parts 4…Installation of a certain hardware takes a random amount of time with a standard deviation of 7 minutes. A computer technician installs this hardware on 50 different computers. These times are given in the accompanying dataset. Compute a 95% confidence interval for the mean installation time. Round your answers to two decimal places and use ascending order. 21 37 36 34 46 42 38 30 55 30 54 33 37 33 54 46 54 47 34 25 60 46 50 24 56 55 24 59 31 51 51 34 59 23 47 59 31 43 58 45 56 52 44 58 31 31 31 45 60 35Question:Seven pilots were tested in a flight simulator, and the time taken (in seconds) for each of them to complete a certain corrective action was measured and given as follows. 5.2 7.9 7.6 4.3 4.8 3.6 9.0 Construct a 99% confidence interval for the standard deviation of the true variability for the time taken to complete the corrective action.Q31Sample 2 Assume that both populations are normally distributed. a) Test whether H1 # µ2 at the a = 0.05 level of significance for the given sample data. b) Construct a 95% confidence interval about u, - 42. Sample 1 10 10 8.9 2.2 10.9 3.1 E Click the icon to view the Student t-distribution table, O A. Ho: H1 =#2, H1: H1 > H2 OB. Ho: H1 = H2, H1: 41 #H2 O C. 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