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# LIIII Score:25 of 3 pm 4 14 of 14 [14 complete) 7 b HW Score:29%, 31.72 of 40; @ 9.49-T 55 Question Help a A manager ofa pizza restaurant has changed...

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LIIII Score: 0.25 of 3 pm 4 14 of 14 [14 complete) 7 b HW Score: 79.29%, 31.72 of 40; @ 9.3.49-T 55 Question Help a A manager ofa pizza restaurant has changed the restaurant’s delivery process in an eﬁort to reduce the mean time between the order and completion oi delivery from
the cunent 30 minutes. Asemple of 35 orders using the new delivery process yields a sample mean of 215 minutes and a sample standard deviation of 6 minutes.
Complete parts (a) through {d} below. a. Using the clitical value approach. at the 0.05 level of signiﬁcance, is there evidence that the population mean delivery time has been reduced below the previous
population mean value of 3-0 minutes? State the null and alternative hypotheses for this test. arts. HD: [1,230 ail-B. Hu=u&lt;30 -:iji:- c. Hozpsao
H1:p,&lt;30 H1:|_|230 H1zp&gt;30 -'ij::- D. H0:p&gt;3o -:::::- E. Hﬂmzﬂﬁ -:::::- F. Hozpsﬁ'ﬁ
H1: use: H1:|.|&lt;2?.6 H,:p&gt;2?.s What is the test statistic for this test? tSTAT = :l
(Type an integer or a decimal. Round to two decimal places as needed.) Enter your answer in the answer box and then click Check Answer. ® agglnlng - CIearAII GhecKAnswer l d p

LIH Score: 1.2 of 3 pm 4 10 0114(14 complete) v F H?! Score: 79.29%, 31.?2 of 404
@ 9.2.25 55 Question Help 1:: A manufacturer ofchocolate Ilndies uses machines to package Ilndies as theyI move along a ﬁlling line. Although the packages are labeled as 3 ounces, the
companyr wants the packages to contain a mean oi 8.1? ounces so that virtually none of the packages contain less than 8 ounces. A sample of50 packages is selected
periodically, and the packaging process is stopped it there is evidence that the mean amount packaged is diﬁerent from 8.1‘l‘r ounces. Suppose that in a particular
sample ofﬁﬂ packages, the mean amount dispensed is 8.179 ouncesr with a sample standard deviation ofOﬂ-Il-B ounce. Complete parts (a) and (b). Click here to view page 1 of the critical values for the t Distribution. Click here to view page 2 of the critical values for the t Distribution. a. Is there evidence that the population mean amount is different from 3.1? ounces? (Use a 0.10 level of signiﬁcance.)
State the null and altemative hypotheses.
Ho: p = 3.1? H1:|.| a! 3.1?
[Type integers or decimals.) Identify the critic-l value(s}. The critical valuels} is(are)
(Round to four decimal places as needed. Use a comma to separate answers as needed.) Enter your answer In the answer box and then click Check Answer. ® 4%;“19 - ' CIearAII CheckAnswer l { )

Llrl Score: 0.6 of 3 pts 4 9 of 14 (14 complete] v b HIV Score: 79.29%, 31.72 of 40;
® 9.1 .14-T :5 Question Help or The quality—control manager ata compact ﬂuorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7.50?
hours. The population standard deviation is 1,030 hours. A random sample ofﬂl light bulbs indicates a sample mean life of I20? houm. a. At the 0.05 level ofsigniﬁcance, is there evidence that the mean life is different from ?,50? hours? b. Compute the p-value and interpret its meaning. 0. Construct a 95% conﬁdence interval estimate of the population mean life oi the light bulbs.
d. Compare the results ot (a) and (e). What conclusions do you reach? a. Let p, be the population mean. Determine the null hypothesis, Ho: and the alternative hypothesis, H1. Ho:p= r50?
Hp“: r50? What is the test statistic? ZSTAT = Cl (Round to two decimal places as needed.) Enter your answer In the answer box and then click Check Amwer. ® saglning - CIearAII CheckAnswer l 4 )

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