MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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- The average final exam score for the statistics course is 74%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is higher. The final exam scores for the 14 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 82, 85, 97, 74, 84, 87, 65, 63, 79, 97, 69, 61, 83, 78 What can be concluded at the the αα = 0.05 level of significance level of significance? The null and alternative hypotheses would be: H0:H0: ? μ p Select an answer > ≠ < = H1:H1: ? p μ Select an answer ≠ = > < The test statistic ? z t = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.)arrow_forwardFor a normal distribution What z-score separates the highest 10% from the rest of the scores? What z-score separates the highest 30% from the rest of the scores? What z-score separates the lowest 40% from the rest of the scores? What z-score separates the middle 86% of the distribution from the rest of the scores?arrow_forwardThe average final exam score for the statistics course is 77%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is different. The final exam scores for the 13 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 77, 91, 64, 96, 96, 75, 74, 78, 84, 98, 78, 80, 74 What can be concluded at the the a = 0.10 level of significance level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ?✓ Select an answer ✓ H₁: ? Select an answer c. The test statistic ? ✓ = d. The p-value = e. The p-value is ? ✓ a f. Based on this, we should [Select an answer the null hypothesis. (please show your answer to 3 decimal places.) (Please show your answer to 4 decimal places.)arrow_forward
- A certain brokerage house wants to estimate the mean daily return on a certain stock. A random sample of 10 days yields the following return percentages. -2.1, -1.77, 0.35 , 2.08, 1.98, 0.08, –2.89,-2.79, -2.48,2.56 Send data to calculator Send data to Excel If we assume that the returns are normally distributed, find a 99% confidence interval for the mean daily return on this stock. Give the lower limit and upper limit of the 99% confidence interval. Carry your intermediàte computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower ? limit: Upper limit: O Oarrow_forwardThe average final exam score for the statistics course is 81%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is higher. The final exam scores for the 16 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 81, 81, 96, 78, 92, 94, 87, 92, 75, 87, 69, 98, 68, 95, 98, 92 What can be concluded at the the a = 0.05 level of significance level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Но: Select an answer v H1: ? v Select an answer v C. The test statistic ? v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? v f. Based on this, we should Select an answer ♥ the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest the populaton mean is significantly higher than…arrow_forwardSix animal trainers took a test before training and after training. The scores are shown in the table. Assume that the two samples are randomly selected from normally distributed populations. At the 0.1 significance level, test the claim that the training had a positive effect on the test scores. (Be sure to subtract in the same direction). Before (%) | After (%) | Difference 66 74 74 65 70 79 69 84 60 86 63 99 What are the correct hypotheses? (Select the correct symbols and values.) Họ: Select an answer v ? v Select an answer v H: Select an answer v ? vSelect an answer v Original Claim =Select an answer v df = Based on the hypotheses, find the following: Test Statistic (Round to three decimal places and show work in the "show work" box below.) Critical value(s) = (Round to three decimal places.)arrow_forward
- Calculate the P value as well. Thanksarrow_forwardThe average final exam score for the statistics course is 79%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is lower. The final exam scores for the 13 randomly selected students who were glven the colored pens are shown below. Assume that the distribution of the population is normal. 87, 58, 66, 70, 71, 72, 90, 83, 60, 63, 70, 89, 60 What can be concluded at the the a = 0.05 level of significance level of significance? a. For this study, we should use t-test for a population mean b. The null and alternative hypotheses would be: Hạ: [pv|V| = H: [uvv # C. The test statistic t v (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value isarrow_forwardThe average final exam score for the statistics course is 75%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is different. The final exam scores for the 13 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 75, 70, 86, 92, 71, 82, 89, 74, 90, 64, 89, 80, 71 What can be concluded at the the a 0.05 level of significance level of signtficance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ?vSelect an answerv H1: ?vSelect an answerv C. The test statistic ?v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ?v a f. Based on this, we should Select an answerv the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest the population mean is not significantly different from 75 at…arrow_forwardWhich BEST describes the shape of the distribution? Uniform Skewed right Skewed left Symmetricalarrow_forwardRepostarrow_forwardFor the following test, assume that the two samples are independent simple random samples selected from normally distributed populations and that the population standard deviations are equal (01 = 02) so that the standard error of the difference between means is obtained by pooling the sample variances. A researcher was interested in comparing the amount of time spent studying baboons by women and men from a group of anthropologists. Independent simple random samples of 35 women and 36 men were selected, and each person was asked how many hours they had studied the baboons during the previous week. The summary is shown in the table. Women Men n - 35 women = 36 men n2 I, = 17.1 hours , - 17.2 hours 52 = 2.3 hours %3D 51 = 1.5 hours Use a 0.1 significance level to test the claim that the mean amount of time spent studying baboons by women is smaller than it is for men. What are the correct hypotheses? (Select the correct symbols and use decimal values not percentages.) Ho: Select an…arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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