In a study of the effect of cigarette smoking on the carbon monoxide diffusing capacity (DL) of the lung, researchers found that current smokers had DL readings significantly lower than those of either ex-smokers or nonsmokers. The carbon monoxide diffusing capacities for a random sample ofn= 20

current smokers are listed here.

103.76888.70272.903123.08691.15292.29561.77590.77784.02375.914100.61588.11771.11082.21589.222102.754108.47973.254106.85590.579

(a)

Do these data indicate that the mean DL reading for current smokers is significantly lower than100 DL,the average for nonsmokers? Use= 0.01.

State the null and alternative hypotheses.

H₀:= 100 versusH_a:> 100

H₀:= 100 versusH_a:< 100

H₀:< 100 versusH_a:> 100

H₀:= 100 versusH_a:100

H₀:100 versusH_a:= 100

State the test statistic. (Round your answer to three decimal places.)

t=

State thep-value.

p-value < 0.005

0.005 <p-value < 0.010

0.010 <p-value < 0.025

0.025 <p-value < 0.050

0.050 <p-value < 0.100

p-value > 0.100

State the conclusion.

H₀is rejected. There is insufficient evidence to conclude that the mean DL reading for current smokers is significantly lower than 100 DL, the average for nonsmokers.

H₀is rejected. There is sufficient evidence to conclude that the mean DL reading for current smokers is significantly lower than 100 DL, the average for nonsmokers.

H₀is not rejected. There is sufficient evidence to conclude that the mean DL reading for current smokers is significantly lower than 100 DL, the average for nonsmokers.

H₀is not rejected. There is insufficient evidence to conclude that the mean DL reading for current smokers is significantly lower than 100 DL, the average for nonsmokers.

(b)

Find a 99% one-sided upper confidence bound for the mean DL reading for current smokers. (Round your answer to three decimal places.)

Does this bound confirm your conclusions inpart (a)?

Since= 100

---Select---

falls

does not fall

in the confidence interval, it is

---Select---

likely

unlikely

that the mean DL reading for current smokers is greater than or equal to 100 DL. This

---Select---

agrees

disagrees

with the conclusion from part (a).

You may need to use the appropriateappendix tableortechnologyto answer this question.