The market research director for Dotty’s Department Store wants to study women’s spending on cosmetics. A survey of the store’s customers is designed in order to estimate the proportion of women who purchase their

cosmetics primarily from Dotty’s Department Store and

the mean yearly amount that women spend on cosmetics.

A previous survey found that the standard deviation of the

amount women spend on cosmetics in a year is approximately $18.

a. What sample size is needed to have 99% confidence of estimating the population mean amount spent to within

b. How many of the store’s credit card holders need to be

selected to have 90% confidence of estimating the population proportion to within +-0.045?

1. descriptive statistics quickly describe large amounts of data can predict future stock returns with surprising accuracy statisticians understand non-numeric information, like colors refer mainly to patterns that can be found in data 2. a 15% return on a stock means that 15% of the original purchase price of the stock returns to the seller at the end of the year 15% of the people who purchased the stock will see a return the stock is worth 15% more at the end of the year than at the beginning the stock has lost 15% of its value since it was originally sold 3. a stock purchased on january 1 cost $4.35 per share. the same stock, sold on december 31 of the same year, brought in $4.75 per share. what was the approximate return on this stock? 0.09% 109% 1.09% 9% 4. a stock sells for $6.99 on december 31, providing the seller with a 6% annual return. what was the price of the stock at the beginning of the year? $6.59 $1.16 $7.42 $5.84

Fill in the missing words to correctly complete each sentence about analyzing a job posting. when reviewing a job posting, it’s important to check theto determine whether it’s worth your time to apply. if the post has been up for a while or it’s already closed, move on to the next position. if it’s still available, take note of when it closes so you’ll know when you mayfrom the company in regard to an interview.

Rats that received electric shocks were unlikely to develop ulcers if the