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1. The cost of a daily newspaper varies from city to city. However, the variation among prices remains steady with a standard deviation of 20 cents. A study was done to test the claim that the mean cost of a daily newspaper is $1.00. Twelve costs yield a mean cost of 95 cents with a standard deviation of 18 cents. Do the data support the claim at the 1% level

1. The cost of a daily newspaper varies from city to city. However, the variation among prices remains steady with a standard deviation of 20 cents. A study was done to test the claim that the mean cost of a daily newspaper is $1.00. Twelve costs yield a mean cost of 95 cents with a standard deviation of 18 cents. Do the data support the claim at the 1% level

MATLAB: An Introduction with Applications
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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1. The cost of a daily newapaper varies from city to city. However, the variation among prices remains steady with a standard deviation of 20 cents. A study was done to test the claim that the mean cost of a daily newspaper is $1.00. Twelve costs yield a mean cost of 95 cents with a standard deviation of 18 cents. Do the data support the dlaim at the 1% level 2. An artide in the Daily Bulletin stated that students in Angeles City University take 4.5 years on average to finish their undergraduate degrees. Suppose you believe that the mean time is longer. You conduct a survey of 49 students and obtain a sample mean of 5.1 with a sample standard deviation of 1.2. Do the data support your claim at the 1% level? 3. Table below shows the birth rate per 1000 popul ation during the years 1990-1996. Year 1990 1991 1992 1993 1994 1995 1996 Birth rate per 1000 16.5 16.3 15.9 15.5 15.2 14.8 14.5 a Graph the data b. Fmd the least squares Ime fittimg the data c. Predict the birth rate in 2000, assuming the trend continues. 4. Table below shows the average temperature and precipitation in a city for the month of July during the years 1989-1998. Find the correlation coefficient r and p and their verbal mterpretation. Year 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 Temperature (F) 78.1 71.8 75.6 72.7 75.3 73.6 75.1 75.3 738 70.4 Precipitation (in) 6.23 3.64 3.42 2.84 1.83 2.82 4.04 2.56 1.18 4.19
Transcribed Image Text:1. The cost of a daily newapaper varies from city to city. However, the variation among prices remains steady with a standard deviation of 20 cents. A study was done to test the claim that the mean cost of a daily newspaper is $1.00. Twelve costs yield a mean cost of 95 cents with a standard deviation of 18 cents. Do the data support the dlaim at the 1% level 2. An artide in the Daily Bulletin stated that students in Angeles City University take 4.5 years on average to finish their undergraduate degrees. Suppose you believe that the mean time is longer. You conduct a survey of 49 students and obtain a sample mean of 5.1 with a sample standard deviation of 1.2. Do the data support your claim at the 1% level? 3. Table below shows the birth rate per 1000 popul ation during the years 1990-1996. Year 1990 1991 1992 1993 1994 1995 1996 Birth rate per 1000 16.5 16.3 15.9 15.5 15.2 14.8 14.5 a Graph the data b. Fmd the least squares Ime fittimg the data c. Predict the birth rate in 2000, assuming the trend continues. 4. Table below shows the average temperature and precipitation in a city for the month of July during the years 1989-1998. Find the correlation coefficient r and p and their verbal mterpretation. Year 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 Temperature (F) 78.1 71.8 75.6 72.7 75.3 73.6 75.1 75.3 738 70.4 Precipitation (in) 6.23 3.64 3.42 2.84 1.83 2.82 4.04 2.56 1.18 4.19
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