Estimating Total Sales at a Home Party

[ChrisBlack]

Homework Statement

Janet sells cookware at home parties, she wants to estimate the average amount a client spends at each party. A random sample of 35 receipts gave a mean of X bar = $34.70 with standard deviation s = %4.85.

a) find a 90% confidence interval for the average amount spent by all clients.

b) for a party with 35 clients, use part (a) to estimate a range of dollar values for Janet's total sales at that party.

Homework Equations

The Attempt at a Solution

I found the 90% confidence interval with no problem and got 33.32 < X bar < 36.09 but I don't understand what part (b) is asking, it seems to me that it is asking the same exact thing that (a) was

 

[Redbelly98]

Homework Statement

Janet sells cookware at home parties, she wants to estimate the average amount a client spends at each party. A random sample of 35 receipts gave a mean of X bar = $34.70 with standard deviation s = %4.85.

a) find a 90% confidence interval for the average amount spent by all clients.

b) for a party with 35 clients, use part (a) to estimate a range of dollar values for Janet's total sales at that party.

Homework Equations

The Attempt at a Solution

I found the 90% confidence interval with no problem and got 33.32 < X bar < 36.09 but I don't understand what part (b) is asking, it seems to me that it is asking the same exact thing that (a) was

(a) is asking about the average value, while (b) is asking for a total amount from 35 clients.