19of21 (12complete) This Test: 200 pts possible his Question: 16 pts astion Help

Question

19of21 (12complete) This Test: 200 pts possible his Question: 16 pts astion Help * ane shown in the table. Assume that the two samples are independent simple random samples selected from A study was done using a treatment group and a placebo group. The resuts nomally distributed populations, and do not ssume that the population standand devations aro oqual. Completo parts (a) ard (b) below Use a 001 signifcance level for both parts. 237 261 The test statistic, t s 1.1Round to two decimal places as noaded) The Pvatlue is 0240(Round to three decimal places as needed.) State the conciusion for the test O A Fal to reject the ut hypothesis. There is sufficient evidenoe to warrant sejection of the claim thar the two sampies are trom populations wth the same meen O B. Reject the nul hyoothesis There is sufficient evidence to warrant rejection of the claim that the two samples are from popuistions with the same mean O C Fal to rejest the null hypothesis. There is not sutficient eiderce to warnsant rejection of the cam that the two sampies are ftom pepulations with the same mean. O D. Reject the null hypothesis. There is not suficient evidence to warrant rejection of the daim hat the bwo samples are from populetions with the ssme mean. b Construct a confdence interval suitable for teating the claim that the two samples are from popalations weh the same mean Round to three decimai places as needed) Cick to select your arwor) 30 , 5 8 0. 2 3 4 0

Explanation / Answer

using stat disk

H0: mu1=mu2

H1: mu1 not equal to mu2

Not eq. vars: No Pool (and df calculated with Formula 9-1)

Alternative Hypothesis:
µ1 not equal µ2

Test Statistic, t: -1.1869
Critical t: ±2.656285
P-Value: 0.2397

p value> alpha ( failed to reject null hypothesis)

Degrees of freedom: 62.8958

99% Confidence interval:
-0.7771116 < µ1-µ2 < 0.2971116

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