Intro Stats
4th Edition
ISBN: 9780321826275
Author: Richard D. De Veaux
Publisher: PEARSON
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Chapter 18, Problem 27E
Speed of light In 1882, Michelson measured the speed of light (usually denoted c as in Einstein’s famous equation E = mc2). His values are in km/sec and have 299,000 subtracted from them. He reported the results of 23 trials with a mean of 756.22 and a standard deviation of 107.12.
- a) Find a 95% confidence interval for the true speed of light from these statistics.
- b) State in words what this interval means. Keep in mind that the speed of light is a physical constant that, as far as we know, has a value that is true throughout the universe.
- c) What assumptions must you make in order to use your method?
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Answer numbers 11-15
Approximate the population mean and standard deviation of age for females. By the way, we find the midpoints by adding the first numbers before the hyphens in the age column and then dividing by 2 (ex: 0+10/2=5, 10+20/2=15, 20+30/2=25).
Question 6 (For question 6, just write down the answer. No explanation is needed.)
(a) Sam and Peter are classmates. In an examination, Sam gets 75 marks and Peter gets 89 marks. It is
known that the standard normal score of Sam's marks is 0, zsam) = 0 and the standard normal score of
Peter's marks is 1.75, z(Peter) = 1.75. Find the standard deviation of the examination marks.
(b) The table below indicates the number of refund cases and the average amount of refund per case in
January to March by a department store:
January
February
March
Number of refund cases
12
12
received in a month
Average amount of refund
$660
$780
$1000
per case in a month
Find the overall average amount of refund per case between January and March.
(c) In a city, the consumer price index in 2015, 2016, and 2017 were 100, 108.5, and 113.5 respectively.
Find the percentage change of price from 2016 to 2017.
(d) Write down the name of the sampling method for the following cases:
(di) A fair representative of staff…
Chapter 18 Solutions
Intro Stats
Ch. 18.2 - Every 10 years, the United States takes a census....Ch. 18.2 - Prob. 2JCCh. 18.2 - Prob. 3JCCh. 18.2 - Every 10 years, the United States takes a census....Ch. 18.2 - Prob. 5JCCh. 18.2 - Prob. 6JCCh. 18 - Salmon A specialty food company sells whole King...Ch. 18 - LSAT The LSAT (a test taken for law school...Ch. 18 - Prob. 3ECh. 18 - t-models, part II Using the t tables, software, or...
Ch. 18 - t-models, part III Describe how the shape, center,...Ch. 18 - Prob. 6ECh. 18 - Prob. 7ECh. 18 - Home sales again In the previous exercise, you...Ch. 18 - Prob. 9ECh. 18 - Prob. 10ECh. 18 - Prob. 11ECh. 18 - Prob. 12ECh. 18 - Prob. 13ECh. 18 - Prob. 14ECh. 18 - Cattle Livestock are given a special feed...Ch. 18 - Prob. 16ECh. 18 - Meal plan After surveying students at Dartmouth...Ch. 18 - Prob. 18ECh. 18 - Prob. 19ECh. 18 - Prob. 20ECh. 18 - Prob. 21ECh. 18 - Credit card charges A credit card company takes a...Ch. 18 - 23. Normal temperature The researcher described in...Ch. 18 - Parking Hoping to lure more shoppers downtown, a...Ch. 18 - 25. Normal temperatures, part II Consider again...Ch. 18 - 26. Parking II Suppose that, for budget planning...Ch. 18 - Speed of light In 1882, Michelson measured the...Ch. 18 - Prob. 28ECh. 18 - Prob. 29ECh. 18 - Prob. 30ECh. 18 - Prob. 31ECh. 18 - Prob. 32ECh. 18 - Prob. 33ECh. 18 - Golf balls The United States Golf Association...Ch. 18 - Prob. 35ECh. 18 - Computer lab fees The technology committee has...Ch. 18 - Marriage In 1960, census results indicated that...Ch. 18 - Prob. 38ECh. 18 - Prob. 39ECh. 18 - Prob. 40ECh. 18 - Prob. 41ECh. 18 - Prob. 42ECh. 18 - Prob. 43ECh. 18 - 44. Yogurt Consumer Reports tested 11 brands of...Ch. 18 - 45. Maze Psychology experiments sometimes involve...Ch. 18 - Prob. 46ECh. 18 - 47. Driving distance 2011 How far do professional...Ch. 18 - Prob. 48E
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