19. Is Old Faithful Not Quite So Faithful? Listed below are time intervals (min) between eruptions of the Old Faithful geyser. The "recent" times are within the past few years, and the "past" times are from 1995. Does it appear that the mean time interval has changed? Is the con- clusion affected by whether the significance level is 0.05 or 0.01? Recent 78 91 89 79 57 100 62 87 70 88 82 83 56 81 74 102 61 Past 89 88 97 98 64 85 85 96 87 95 90 95

19. Is Old Faithful Not Quite So Faithful? Listed below are time intervals (min) between eruptions of the Old Faithful geyser. The "recent" times are within the past few years, and the "past" times are from 1995. Does it appear that the mean time interval has changed? Is the con- clusion affected by whether the significance level is 0.05 or 0.01? Recent 78 91 89 79 57 100 62 87 70 88 82 83 56 81 74 102 61 Past 89 88 97 98 64 85 85 96 87 95 90 95

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Description: 19. Is Old Faithful Not Quite So Faithful? Listed below are time intervals (min) betweeneruptions of the Old Faithful geyser. The "recent" times are within the past few years, and the"past" times are from 1995. Does it appear that the mean time inte

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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O DESCRIPTIVE STATISTICS Mean, median, and mode: Comparisons The total blood cholesterol level was measured for each of 21 adults. Here are the 21 measurements (in mg/dL). 132, 144, 151, 153, 165, 167, 176, 180, 184, 184, 184, 194, 195, 196, 196, 210, 211, 214, 219, 234, 241 Send data to calculator Send data to Excel Frequency 10 6. 8- 6+ 4 4 2- 150 175 200 225 250 125 Cholesterol level (in mg/dL) OMean (a) For these data, which measures of central tendency take more than one value? Choose all that apply. OMedian O Mode ONone of these measures (b) Suppose that the measurement 241 (the OMean largest measurement in the data set) were Median Check Explanation 2021 McGraw-Hl Education. All Righ II
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Question 3 According to a Kaiser Family Foundation survey, children aged 8 to 18 years in the United States spend an average of 190 minutes per day watching television. A recent random sample of 4 such children showed the following results: 200, 210, 230, 220 (in minutes) At the 5% level of significance, can you conclude that the current mean time spent watching television per day by children in this age group differs from 190 minutes? a)Step 1: State the null and alternative hypotheses. b)Step 2: Write down the appropriate test statistic (formula) , but first check assumptions c) Step 3 :Write down the rejection region of your test. d)Step 4: Compute the value of the test statistic (i) The sample mean = The sample standard deviation = (iii) The value of the test statistic = e) Step 5: State your conclusion: (i) Reject Ho Do not reject Ho (Just circle) (ii) In one sentence apply the results to the problem. f)What type of mistake could you have made in your hypothesis test? (Just circle…
Applying the Concepts and SkillsAir-Conditioning Repairs. Richard’s Heating and Cooling in Prescott, Arizona, charges $55 per hour plus a $30 service charge. Let x denote the number of hours required for a job, and let y denote the total cost to the customer.a. Find the equation that expresses y in terms of x.b. Determine b0 and b1.c. Construct a table similar to Table on page 620 for the x-values 0.5, 1, and 2.25 hours.d. Draw the graph of the equation that you determined in part (a) by plotting the points from part (c) and connecting them with a line.e. Apply the graph from part (d) to estimate visually the cost of a job that takes 1.75 hours. Then calculate that cost exactly by using the equation from part (a).TABLETimes and costs for five word-processing jobs Time (hr) Cost (S) x y 5.0 125 7.5 175 15.0 325 20 425 22.5 475
Classify the following statement as an example of classical probability, empirical probability, or subjective probability. Explain your reasoning. The probability that a randomly selected number from 1 to 400 is divisible by 9 is 0.11. This is an example of probability, since every number from 1 to 400 has an equal chance of being divisible by 9. the stated probability is calculated based on observations from randomly-selected numbers. every number from 1 to 400 has an equal chance of being selected. it deals with a continuous period rather than a fixed number of trials. the stated probability is most likely based on intuition, an educated guess, or an estimate.
K A company is developing a new high performance wax for cross country ski racing. In order to justify the price marketing wants, the wax needs to be very fast. Specifically, the mean time to finish their standard test course should be less than 55 seconds for a former Olympic champion. To test it, the champion will ski the course 8 times. The champion's times (selected at random) are 54.9, 63.7, 48.1, 53.9, 49.3, 47.4, 53.7, and 44.9 seconds to complete the test course. Should they market the wax? Assume the assumptions and conditions for appropriate hypothesis testing are met for the sample. Use 0.05 as the P-value cutoff level. Choose the correct null and alternative hypotheses below. Ο A. Ho:μ = 55 HAH55 Calculate the test statistic. ... t= OB. Ho:μ>55 HA:μ = 55 OD. Ho:μ<55 HAH=55 (Round to three decimal places as needed.) Calculate the P-value. P-value= (Round to four decimal places as needed.) Choose the correct clusion below. A. No, do not market the wax as there is insufficient…
Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 11 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: 2.8 2.6 3 2.2 2.1 2.6 2.7 3 2.3 2.3 a. What is a point estimate for the population mean length of time. (Round answer to 4 decimal places) b. Which distribution should you use for this problem? O normal distribution Ot-distribution c. Why? d. What must be true in order to construct a confidence interval in this situation? O The population mean must be known O The population standard deviation must be known O The population must be approximately normal O The sample size must be greater than 30 e. Construct a 99% confidence interval for the population mean length of time. Enter your answer as an open-interval (l.e., parentheses) Round upper and lower bounds to two decimal places f. Interpret the confidence interval in a complete sentence. Make sure you…
Section 9.2 Question #8 Listed below are time intervals (min) between eruptions of a geyser. Assume that the "recent" times are within the past few years, the "past" times are from around 20 years ago, and that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Does it appear that the mean time interval has changed? Is the conclusion affected by whether the significance level is 0.10 or 0.01? Recent 77 91 90 78 57 100 61 87 69 89 83 83 55 81 73 101 61 Past 90 89 93 94 64 85 85 92 88 91 89 91 Let μ1 be the recent times and let μ2 be the past times. What are the null and alternative hypotheses? A. H0: μ1 = μ2 H1: μ1 ≠ μ2 B. H0: μ1 < μ2 H1: μ1 = μ2 C. H0: μ1 = μ2 H1: μ1 > μ2 D. H0: μ1 ≠ μ2…
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Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 11 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: 2.8 2.6 2.2 2.1 2.6 2.7 3 2.3 2.3 a. What is a point estimate for the population mean length of time. (Round answer to 4 decimal places) b. Which distribution should you use for this problem? O normal distribution O-distribution c. Why? d. What must be true in order to construct a confidence interval in this situation? O The population mean must be known O The population standard deviation must be known O The population must be approximately normal O The sample size must be greater than 30 e. Construct a 99% confidence interval for the population mean length of tim Enter your answer as an open-interval (i.e., parentheses) Round upper and lower bounds to two decimal places f. Interpret the confidence interval in a complete sentence. Make sure you include…
A study was conducted to investigate factors such as diet and environment that may be related to the formation of enteroliths (enteroliths are calcifications that form in the gut of a horse and can cause considerable morbidity and mortality). The study contained seven stallions with their ages, in years, as follows: 7 12 10 14 Calculate the mean age for this group of stallions. Calculate to one place past the decimal. 14 10 11