Question

Lori Jeffrey is a successful sales representative for a major publisher of college textbooks. Historically, Lori obtains a book adoption on 30% of her sales calls. Viewing her sales calls for one month as a sample of all possible sales calls, assume that a statistical analysis of the data yields a standard error of the proportion of 0.0450. User-table. a. How large was the sample used in this analysis? That is, how many sales calls did Lori make during the month? b. Let p indicate the sample proportion of book adoptions obtained during the month. Show the sampling distribution of p. It is normal distribution because np and n(1-P) - Select your answer than Choose the correct graph.

Answer 1

ay Standard error of proportion VPLIER) =) 0:0450 SE (6.3)(0.7) -0.0450 n squarring on both sides 0.21 0.002025 n u:103.70 Lori made 104 calls b let s indicate the sample proportion of book adoptions during the month Sampling distribution of p is approximately Normal because up cow (0-3) -) n(1-P) =) ( 104) (0.7) =) 72.8 up &n (1-P) grater 3/02 then (09) equal to lo В S.E: 0.0450. option 0.16 0.44 0-80-32 32 03 CS Scanned with CamScanner

(e) نہ یہ PLĂ > 394 P (P >0.3 z =R-up I -) P(Z > 0-39-0.3 =) p(272) 0.0450 =) - P(Z22) -> 0.9792 =) 10.0228 CS Scanned with CamScanner