The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card. You are given the following information. Store's Card

Major Credit Card

Sample size
64

49

Sample mean
$140

$125

Population standard deviation
$10

$8



A point estimate for the difference between the mean purchases of all users of the two credit cards is?

At 95% confidence, the margin of error is?

A 95% confidence interval estimate for the difference between the average purchases of all customers using the two different credit cards is?

Browning labs is testing a new growth inhibitor for a certain type of bacteria. the bacteria naturally grows exponentially each hour at a rate of 6.2%. the researchers know that the inhibitor will make the growth rate of the bacteria less than or equal to its natural growth rate. the sample currently contains 100 bacteria. the container holding the sample can hold only 300 bacteria, after which the sample will no longer grow. however, the researchers are increasing the size of the container at a constant rate allowing the container to hold 100 more bacteria each hour. they would like to determine the possible number of bacteria in the container over time. create a system of inequalities to model the situation above, and use it to determine how many of the solutions are viable.

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values

What is the approximate mark up percentage rate before m equals $1740 marked up from p equals $19,422