Question

Use a 0.05 significance level to test the claim females and males have the same mean BMI.

Female BMI |
n=70 |
x̄ =29.10 |
s= 7.39 |

Male BMI |
n=80 |
x̄ =28.38 |
s= 5.37 |

Critical Values: z0.005 = 2.575, z0.01 = 2.325, z0.025 = 1.96, z0.05 = 1.645

When d.f.=7: t0.005 = 3.499, t0.01 = 2.998, t0.025 = 2.365, t0.05 = 1.895

When d.f.=69: t0.005 = 2.648, t0.01 = 2.381, t0.025 = 1.994, t0.05 = 1.667

Answer #1

Critical Values: z0.005 = 2.575, z0.01 = 2.325, z0.025 = 1.96,
z0.05 = 1.645
When d.f.=7: t0.005 = 3.499, t0.01 = 2.998, t0.025 = 2.365,
t0.05 = 1.895
When d.f.=69: t0.005 = 2.648, t0.01 = 2.381, t0.025 = 1.994,
t0.05 = 1.667
Among 198 smokers who underwent a “sustained care” program, 51
were no longer smoking after 6 months. Among 199 who underwent a
“standard care” program, 30 were no longer smoking after 6 months.
Use a 0.01 significance level...

Listed below is are lead concentrations in some medicines. Use a
0.05 significance level to test the claim that the mean lead
concentration is less than 14. x̄=11.05 Sx=
6.46
3.0, 6.5, 6.0, 5.5, 20.5, 7.5, 12.0, 20.5, 11.5,
17.5
Critical Values: z0.005 = 2.575, z0.01 = 2.325, z0.025 =
1.96, z0.05 = 1.645
When d.f.=6: t0.005 = 3.707, t0.01 = 3.143, t0.025 =
2.447, t0.05 = 1.943
When d.f.=9: t0.005 = 3.250, t0.01 = 2.821, t0.025 =
2.262, t0.05...

Find the regression line for the following set of data, where r=
−0.959 and use it to predict the crash fatality rate when lemon
imports is 500.
Lemon imports (x)
230
265
358
480
530
x̄=372.6
Sx=130.8
Crash fatality rates (y)
15.9
15.7
15.4
15.3
14.9
x̄=15.44
Sx=0.385
Critical Values: z0.005 = 2.575, z0.01 = 2.325, z0.025 =
1.96, z0.05 = 1.645
When d.f.=6: t0.005 = 3.707, t0.01 = 3.143, t0.025 =
2.447, t0.05 = 1.943
When d.f.=9: t0.005 =...

In a test of the effectiveness of prodaf, 40 out of 45 subjects
treated with prodaf developed a cold. 88 of 103 subjects treated
with a placebo developed a cold. Use a 0.05 significance level to
test the claim that prodaf has an effect on the
likelihood of developing a cold.
Critical Values: z0.005 = 2.575, z0.01 = 2.325, z0.025 =
1.96, z0.05 = 1.645
When d.f.=6: t0.005 = 3.707, t0.01 = 3.143, t0.025 =
2.447, t0.05 = 1.943
When d.f.=9:...

Find the sample size needed to estimate the proportion of people
who play video games, with 90% confidence. Assume a previous poll
shows that about 16% of people play video games. The error should
be less than 3 percent points.
Critical Values: z0.005 = 2.575, z0.01 = 2.325, z0.025 =
1.96, z0.05 = 1.645
When d.f.=6: t0.005 = 3.707, t0.01 = 3.143, t0.025 =
2.447, t0.05 = 1.943
When d.f.=9: t0.005 = 3.250, t0.01 = 2.821, t0.025 =
2.262, t0.05...

A) a sample of 101 body temperatures of randomly selected people
has a mean of 98.20 degrees Fahrenheit and a standard deviation of
0.62 degrees Fahrenheit. Construct a 95% confidence level
confidence interval for the population mean body temperature.
B) Use the above result to test the claim that the population
mean body temperature is 98.6 degrees Fahrenheit with significance
level 0.05.
Critical Values: z0.005 = 2.575, z0.01 = 2.325, z0.025 =
1.96, z0.05 = 1.645
When d.f.=6: t0.005 =...

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