Intro Stats, Books a la Carte Edition (5th Edition)
5th Edition
ISBN: 9780134210285
Author: Richard D. De Veaux, Paul Velleman, David E. Bock
Publisher: PEARSON
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Chapter 15, Problem 51E
To determine
Perform hypothesis test to decide whether the Yvon has met the goal.
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CPUS made of two different materials are tested to see how they effect the processor speed of a computer. Specifically, material 1 is currently in use, but material 2 is acceptable. Since material 2 is
cheaper, it should be adopted, providing it does not change the process yield. A test is run and results are obtained as follows.
n = 8
n, = 8
81
2.39
82
2.98
X1 = 92.255 X2 = 92.733
Construct a 99% confidence interval for the difference of means under equal variance case.
An experimenter wants to study the relationship between type of milk and infant growth in underdeveloped countries. She randomly assigns 300 infants to either a breast-feeding group or an infant formula group. She then weighs the infants every three days for the first four weeks of life.
Yvon Hopps ran an experiment to determine the optimum power and time settings for microwave popcorn. His goal was
to find a combination of power and time that would deliver high-quality popcorn with less than 9% of the kernels left
un-popped, on average. After experimenting with several bags, he determined that power 9 at 4 minutes was the best
combination. To be sure that the method was successful, he popped 8 more bags of popcorn (selected at random) at
this setting. All were of high quality, with the following percentages of uncooked popcorn: 8.4, 11.4, 8.7, 8.3, 4.6, 2.4,
3.2, 5.6. Does the 95% confidence interval suggest that he met his goal of an average of no more than 9%
uncooked kernels? Explain.
The 95% confidence interval for the true mean percentage of unpopped kernels is (%,%).
(Round to two decimal places as needed. Use ascending order.)
ST
Chapter 15 Solutions
Intro Stats, Books a la Carte Edition (5th Edition)
Ch. 15.2 - A research team wants to know if aspirin helps to...Ch. 15.2 - An allergy drug has been tested and found to give...Ch. 15.2 - The new drug is tested and the P-value is 0.0001....Ch. 15.4 - The research team that wants to know if aspirin...Ch. 15.4 - Prob. 5JCCh. 15.6 - Prob. 6JCCh. 15.6 - Prob. 7JCCh. 15.6 - Prob. 8JCCh. 15 - Better than aspirin? A very large study showed...Ch. 15 - Psychic A friend of yours claims to be psychic....
Ch. 15 - Parameters and hypotheses For each of the...Ch. 15 - Hypotheses and parameters As in Exercise 3, for...Ch. 15 - SECTION 15.2 5. Better than aspirin again?...Ch. 15 - GRE performance A test preparation company claims...Ch. 15 - SECTION 15.3 7. Hispanic origin According to the...Ch. 15 - Empty houses According to the 2010 Census, 11.4%...Ch. 15 - Prob. 9ECh. 15 - Marriage In 1960, census results indicated that...Ch. 15 - Prob. 11ECh. 15 - Golf balls The United States Golf Association...Ch. 15 - Prob. 13ECh. 15 - Prob. 14ECh. 15 - CHAPTER EXERCISES 15. Hypotheses Write the null...Ch. 15 - More hypotheses Write the null and alternative...Ch. 15 - Negatives After the political ad campaign...Ch. 15 - Dice The seller of a loaded die claims that it...Ch. 15 - Prob. 19ECh. 15 - Cars A survey investigating whether the proportion...Ch. 15 - Prob. 21ECh. 15 - Prob. 22ECh. 15 - Prob. 23ECh. 15 - Prob. 24ECh. 15 - Dowsing In a rural area, only about 30% of the...Ch. 15 - Abnormalities In the 1980s, it was generally...Ch. 15 - Prob. 27ECh. 15 - Educated mothers The National Center for Education...Ch. 15 - Contributions, please II We learned in Chapter 13,...Ch. 15 - Prob. 30ECh. 15 - Prob. 31ECh. 15 - Scratch and dent An appliance manufacturer...Ch. 15 - Prob. 33ECh. 15 - Football 2016 During the first 15 weeks of the...Ch. 15 - WebZine A magazine is considering the launch of an...Ch. 15 - Seeds A garden center wants to store leftover...Ch. 15 - Prob. 37ECh. 15 - Prob. 38ECh. 15 - Prob. 39ECh. 15 - Acid rain A study of the effects of acid rain on...Ch. 15 - Prob. 41ECh. 15 - TV ads A start-up company is about to market a new...Ch. 15 - Prob. 43ECh. 15 - Prob. 44ECh. 15 - Normal temperature again From the measurements of...Ch. 15 - Hot dogs again The nutrition lab in Chapter 14,...Ch. 15 - Prob. 47ECh. 15 - Computer lab fees again The technology committee...Ch. 15 - More Ruffles Recall from Chapter 14, Exercise 55...Ch. 15 - More Doritos We saw in Chapter 14, Exercise 56...Ch. 15 - Prob. 51ECh. 15 - Prob. 52ECh. 15 - Prob. 53ECh. 15 - Prob. 54ECh. 15 - Maze Here are the data from the researcher...Ch. 15 - Facebook friends According to...Ch. 15 - Maze revisited A student resampled the Maze times...Ch. 15 - Prob. 58ECh. 15 - Prob. 59ECh. 15 - Prob. 60E
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- Yvon Hopps ran an experiment to determine optimum power and time settings for microwave popcorn. His goal was to find a combination of power and time that would deliver high-quality popcorn with less than 10% of the kernels left unpopped, on average. After experimenting with several bags, he determined that power 9 at 4 minutes was the best combination. To be sure that the method was successful, he popped 8 more bags of popcorn (selected at random) at this setting. The data below report the percentages of uncooked popcorn. 2.9 2.8 5.2 6.7 7.0 7.8 10.8 13.2 (a) Using a computer or calculator, calculate the sample mean and the sample standard deviation s. Clearly indicate which quantity is which using the correct symbols and round your answers to two decimal places, if necessary. (b) What percent of unpopped kernels is 3 standard deviations above the mean?arrow_forwardFloods: Rapid drainage of floodwater is crucial to prevent damage during heavy rains. Several designs for a drainage canal were considered for a certain city. Each design was tested five times, to determine how long it took to drain the water reservoir. The following table presents the drainage times, in minutes. Channel Type Drainage Time 1 41.5 43.2 50.2 41.2 24.2 2 38.8 48.2 51.0 38.1 25.2 3 32.7 33.5 35.0 22.7 24.7 4 26.5 30.7 33.1 23.8 26.7 5 45.1 47.3 48.4 37.1 40.0 Construct an ANOVA table. Round your answers to four decimal places. One-way ANOVA: Drainage Time Source DF SS MS F P Minutes Error Totalarrow_forwardFloods: Rapid drainage of floodwater is crucial to prevent damage during heavy rains. Several designs for a drainage canal were considered for a certain city. Each design was tested five times, to determine how long it took to drain the water reservoir. The following table presents the drainage times, in minutes. Channel Type Drainage Time 1 41.4 43.4 50.3 41.4 2 38.7 48.3 50.8 38.4 3 32.3 33.8 34.4 22.3 4 26.1 31.0 33.4 23.6 5 44.7 47.0 48.6 36.9 Send data to Excel Part: 0 / 2 Part 1 of 2 (a) Construct an ANOVA table. Round your answers to four decimal places. One-way ANOVA: Drainage Time Source DF SS MS F Minutes Error Totalarrow_forward
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