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P Take a Test- Julian Mata-Google Chrome Secure https www.mathl.com/student/Player Test.aspo/testld-1766737748centerwin-yes Julian Mata&1 4/3/18 9:10 PM Time Remaining: 00:18:18 Submit Qutz This Quiz: 10 pts possilbl SP18 STAT 251G-D05 Quiz: Quiz 7: Sections 9.1-9.4 This Question: 2 pts 44 of 8 (6 complete) I Question Help 0 The tollowing data represent the pH of rain for a random sample of 12 rain dates A nomal peobablity plot sugpests the data could come from a population that is normaly distrbuted A boxplot indicates there are no outiers Completo parts a) through d) below 5 30 s 02 529 572 5 03 4 76 5 24 4 74 456 4 80 5 19 5 54 ?Cick the icontovew the tatke of obcal ' values pt of ranwater Select the correct choice below and till in the answer boxes to complete your Seled te corect eb) Construct and rterpret a 95% confidence nerval tr the mean choice (Use ascendng onder Round to two decimal places as needed ) land lfrepeated samples are taken 95% of them wil have a sample pH of tan water between OB. Therers a 95% potabity that te tue mean pH oftar, water is between! OC. There is 95% arl contence that the populabon mean pH of ran inter is between-and hoce bekw and finte answer bees to anpkte your (c) Construct and interpret a 99% condence ntorvalfor the mean pH of ranwater choice (Use ascending order Round to two decimal places as needed ) Seed te cored populabon mean pHoftan water is between!?] ard A. There s99% confidence that the 0B. Ir repeated samples are taken. 99% oc. There is a 99% probabity that the true mean pH otan water rs between d) What happens to the interval as the level of contidence is changed? Explain why this is a As the level of confidence increases, the width of the interval of them will have a sample pt of rain water between an logical resst This makes sense since the Cick to select your answer's).Explanation / Answer
The statistical software output for this problem is:
One sample T confidence interval:
? : Mean of variable
95% confidence interval results:
99% confidence interval results:
Hence,
b) Option C; 4.88 and 5.32
c) Option A; 4.79 and 5.41
d) Increases; interval; becomes wider
Variable Sample Mean Std. Err. DF L. Limit U. Limit Data 5.0991667 0.099995896 11 4.8790772 5.3192561Related Questions
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