1. The cost of a daily newspaper varies from city to city. However, the variation among price remains steady with a standard deviation of 20 cents. A study was done to test the daim that the mean cost of a dzily newspaper is $1.00. Twelve costs yield a mean cost of 95 cents with standard deviation of 18 cents. Do the data support the daim at the 1% level 2. An articde in the Daily Bulletin stated that students in Angeles City University take 4.5 years on average to finish their under gradu ate 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 standare deviation of 1.2. Do the data support your cdaim 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 16.5 163 15.9 15.5 15.2 14.8 14.5 2 Graph the data

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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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