Please show all of your work. This is as clear of a photo as I could get. Thank

Question

Please show all of your work. This is as clear of a photo as I could get. Thank you!

3. Sorap is one of critical Eacioers for an astu part masufacturing past. To estimate the cost wasied according to scrapa per day. a rindom sample of 14 day periods are roorded. The awenge cost of 390 with sd S15 based un this sample. Assame daily serap crods are normally disxibatod. . average cost of scraps per day (l) Last ye's scrap had evenge cret of S100 Does this sample of 14 deys dauia froen this year indcale this yeor is significanthy lower than sid year at 05

Explanation / Answer

3) the null hypothesis = H0=u=100

while the alternate hypothesis Ha = u <100

this will be a left tailed test

the degree of freedom = 14-1 = 13

alpha = 0.05

therefore from the t table critical region =t< -1.77

now the test static

= (90 - 100)/(15/sqrt(14))

= -2.5

as t = -2.5<1.77

therefore we will reject the null hypothesis.

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