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9th Edition
ISBN: 9781305779372
Author: Jay L. Devore
Publisher: Cengage Learning
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Chapter 14.3, Problem 26E
Contamination of various food products is an ongoing problem all over the world. The article “Prevalence and Quantitative Detection of Salmonella in Retail Raw Chicken in Shaanxi, China” (J. of Food Production, 2013) reported the following data on the occurrence of salmonella in chicken of three different types: (1) supermarket chilled, (2) supermarket frozen, and (3) wet market fresh slaughtered.
| # Salmonella Positive Samples | |||
| Type | 1. | 60 | 27 |
| 2. | 60 | 32 | |
| 3. | 120 | 45 |
Does it appear that the incidence rate of salmonella occurrence depends on the type of chicken? State and test the appropriate hypotheses using a significance level of .05.
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Contamination of various food products is an ongoingproblem all over the world. The article “Prevalence andQuantitative Detection of Salmonella in Retail RawChicken in Shaanxi, China” (J. of Food Production,2013) reported the following data on the occurrence ofsalmonella in chicken of three different types: (1) supermarketchilled, (2) supermarket frozen, and (3) wetmarket fresh slaughtered.Sample Size# SalmonellaPositive Samples1. 60 27Type 2. 60 323. 120 45Does it appear that the incidence rate of salmonellaoccurrence depends on the type of chicken? State andtest the appropriate hypotheses using a significance levelof .05.
An article describes several studies of the failure rate of defibrillators used in the treatment of heart problems. In one study
conducted by the Mayo Clinic, it was reported that failures were experienced within the first 2 years by 16 of 81 patients under
50 years old and 11 of 369 patients ages 50 and older who received a particular type of defibrillator. Assume it is reasonable to
regard these two samples as representative of patients in the two age groups who receive this type of defibrillator.
A USE SALT
(a) Construct a 95% confidence interval for the proportion of patients under 50 years old who experience a failure within the first
2 years after receiving this type of defibrillator. (Round your answers to three decimal places.)
Interpret the interval.
O we are 95% confident that the proportion of all patients who experience a failure after receiving this type of defibrillator
is within this interval.
O we are 95% confident that the proportion of all patients under 50 years old…
A study was made of 1,057 cases of poisoning in children treated as inpatients at Milwaukee Children's Hospital from 1962 through 1968. Data on date of occurrence, age and sex of the child, and type of agent involved were recorded and analyzed by standard statistical methods. Poisoning was due to ingestion of aspirin in 35 per cent of the children studied and to the ingestion of hydrocarbon distillates in 18 per cent. A statistically significant male dominance was found for ingestion of hydrocarbons; age-specific peaks were found for some categories. Trends as to the relative and absolute frequencies of each specific poison from one year to the next were noted; possible reasons for increasing or decreasing trends are discussed.
Is this study descriptive or inferential? Explain your answer.
What are the variables used in the study? In your opinion, what level of measurement was used to obtain the data from the variables?
Does the article define the population? If so, how is it…
Chapter 14 Solutions
Bundle: Probability and Statistics for Engineering and the Sciences, 9th + WebAssign Printed Access Card for Devore's Probability and Statistics for ... and the Sciences, 9th Edition, Single-Term
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