Dentists make many people nervous. To see whether suchnervousness elevates blood pressure, the blood pressure and pulserates of 60 subjects were measured in a dental setting and in amedical setting. For each subject, the difference (dental-settingblood pressure minus medical-setting blood pressure) wascalculated. The analogous differences were also calculated forpulse rates. Summary data are given below.
| Mean
Difference | Standard
Deviation of
Differences |
|---|
| Systolic Blood Pressure | 4.49 | 8.77 |
| Pulse(beats/min) | ?1.33 | 8.84 |
(a)
Do the data strongly suggest that true mean blood pressure isgreater in a dental setting than in a medical setting? Use a level0.01 test. (Use a statistical computer package to calculate theP-value. Round your test statistic to two decimal places,your df down to the nearest whole number, and your P-valueto three decimal places.)
t=
df=
P-value=
State your conclusion.
We reject H0. We do not have convincingevidence that the mean blood pressure is greater in a dentalsetting than in a medical setting.
We do not reject H0. We have convincingevidence that the mean blood pressure is greater in a dentalsetting than in a medical setting.
We reject H0. We have convincing evidencethat the mean blood pressure is greater in a dental setting than ina medical setting.
We do not reject H0. We do not haveconvincing evidence that the mean blood pressure is greater in adental setting than in a medical setting.
(b)
Is there sufficient evidence to indicate that true mean pulserate in a dental setting differs from the true mean pulse rate in amedical setting? Use a significance level of 0.05. (Use astatistical computer package to calculate the P-value.Round your test statistic to two decimal places, your df down tothe nearest whole number, and your P-value to threedecimal places.)
t=
df=
P-value=
State your conclusion.
We do not reject H0. We have convincingevidence that the mean pulse rate in a dental setting differs fromthe mean pulse rate in a medical setting.
We reject H0. We do not have convincingevidence that the mean pulse rate in a dental setting differs fromthe mean pulse rate in a medicalsetting.
We do not reject H0. We do not haveconvincing evidence that the mean pulse rate in a dental settingdiffers from the mean pulse rate in a medical setting.
We reject H0. We have convincing evidencethat the mean pulse rate in a dental setting differs from the meanpulse rate in a medical setting.
