size Price9147201972729731447351177402177602497321006.93501992.61Find and interpret a 90% confidence interval for the sales price when the corresponding TV size is 50-inches

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Answered: Find and interpret a 90% confidence…

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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Brand A Brand B 35 50 25 55 22 62 38 68 40 57 28 70 The prices of two different brands of calculators at six different shops are listed in the table above. a) Find the mean and standard deviation of each brand. b) For which brand are the prices more variable? I=
Which one of the following statements about confidence intervals is false? Given the same sample of data, a 99% confidence interval will be wider than a 95% confidence interval. The size of the population affects the width of a confidence interval. The sample statistic determines the center of the confidence interval. The value of z* affects the width of a confidence interval. The general format of a confidence interval is “sample statistic ± margin of error.”
Using an ? = 0.04, a confidence interval for a population proportion is determined to be 0.55 to 0.65. For the same data, if ? is decreased, the confidence interval for the population proportion becomes wider.remains the same. uses a zero margin of error.becomes narrower.
Assume that population mean is to be estimated from the sample described. Use the sample results to approximate the margin of error and 95% confidence interval. n = 36, x = 64.4 seconds, s = 6.5 seconds. The margin of error is seconds. (Round to one decimal place as needed.) an example 4
Approximate the measures of center for following GFDT. Data Frequency 30 - 34 1 35 - 39 4 40 - 44 7 45 - 49 11 50 - 54 22 55 - 59 11 60 - 64 9 65 - 69 0 70 - 74 6 mode = median = mean = Report mode and median accurate to one decimal place. Report the mean accurate to two decimal places (or enter as a fraction).
Approximate the standard deviation for following GFDT. Data 60 - 64 65 - 69 70 - 74 75 - 79 80 - 84 85 - 89 90-94 95 - 99 100 - 104 Frequency 12 24 11 8 7 5 2 1 1 sample standard deviation =
Refer to the accompanying data set and construct a 95% confidence interval estimate of the mean pulse rate of adult females; then do the same for adult males. Compare the results. Click the icon to view the pulse rates for adult females and adult males. Pulse Rates Construct a 95% confidence interval of the mean pulse rate for adult females. bpm bpm <µ< (Round to one decimal place as needed.) Pulse Rates (beats per minute) Males Females 87 71 78 86 75 62 93 79 49 73 61 72 71 76 54 51 54 84 61 68 84 90 54 55 81 91 77 78 86 87 52 70 86 89 60 61 53 94 75 66 35 71 61 96 63 88 67 55 81 83 76 69 79 82 84 58 77 76 65 57 62 58 69 66 64 99 99 67 77 75 Enter your answer in the edit fields and then click Check Answer. 42 87 61 76 88 56 64 73
Observed Frequencies Major <50K 50-69K 69K+ TOTAL English 20 20 25 65 Engineering 10 35 50 95 Nursing 5 15 25 45 Business 15 25 25 65 Psychology 10 40 30 80 TOTAL 60 135 155 350 Do college majors have any effect on starting salaries after graduation? 350 recent graduates were surveyed about their majors in college and their starting salaries after graduation. Table 1 below shows the data. Conduct a test of independence at the 99% level of confidence. Round to 2 decimal places. 1.) Type of test to conduct (write one of "Z-test", "t-test" or "Chi-squared test" in the blank): 2.) The test-statistic calculated value is: 3.) The critical value is:
e Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 165 ward areas was 59.2 decibels, and the population standard deviation is 4.2 . Find the 94% confidence interval of the true mean. Use a graphing calculator and round the answers to one decimal place.
The current speed limit is 60 mph. This sample of speeds was taken at 4pm on a Monday. Use the data to construct a 80% confidence interval estimate of the standard deviation for the population speeds. 60 62 62 65 56 62 54 61 60 61 69 58 66 what is the lower limit what is the upper limit
Fill in the blank. The procedure for constructing a confidence interval about a mean is ______ , which means minor departures from normality do not affect the accuracy of the interval.
The problem below looks at forecasting methodologies to determine which forecasting model results in the most accurate forecasts. Accuracy is determined by the lowest mean absolute deviation. Emergency calls to the 911 system of York County for the past 24 weeks are shown below. Accurate forecasts are needed to determine the number of operators needed to staff the station. Week # of Calls 1 50 2 35 3 25 4 40 5 45 6 35 7 20 8 30 9 35 10 20 11 15 12 40 13 55 14 35 15 25 16 55 17 55 18 40 19 35 20 60 21 75 22 50 23 40 24 65 SIMPLE LINEAR REGRESSION Use all of the data, weeks 1 - 24, to calculate the regression equation for this data. Use the weeks (1-24) as the independent variable (x) and number of calls as the dependent variable (y). Once you have the equation, forecast weeks 4 through 24 (enter 4, 5, 6, etc. as the x…

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size	Price
9	147
20	197
27	297
31	447
35	1177
40	2177
60	2497
32	1006.93
50	1992.61