Tutors Answer Your Questions about Proportions (FREE)
Question 580556: The ratio of the price of coffee A to coffee B is 2:3. During a certain month, a store sells coffee A and coffee B in the ratio of 4:5. If the total revenue from the sale of these two coffees is $27,600, how much of the revenue was from the sale of coffee A?
Please explain.
Thanks.
Click here to see answer by mahalingk(2)   |
Question 585034: Ann bought 30 pens at RS 4.50 each. If she had used this amount of money to buy pencils at 3 for RS 5, how many pencils could she have bought?
I have solved this question, the answer is 81 but I have to explain to the 5th grade student. What is the easiest way to explain?
Thanks.
Click here to see answer by josmiceli(9678)  |
Question 589916: The gross federal debt y (in trillions of dollars) for a certain country in year x is approximated by the following equation, where x is the number of years after 2000. Y=0.4x+5.17 In what year will the federal debt be $6.37 trillions?
Click here to see answer by solver91311(16885)  |
Question 593780: Please help me solve this questions.=)
QUESTION 1
Let p1 denote the proportion of people who were unemployed in March, and let p2 denote the proportion of people who were unemployed in April. Suppose that during late March, the government instituted policies designed to lower the unemployment rate. We want to test whether the policies were effective. In March, in a random sample of 1200 people, 75 were unemployed. During April, in an independent random sample of 1100 people, 65 were unemployed. Carry out the appropriate hypothesis test using a 3.5% level of significance.
QUSTION 2
Susan is a sales manager of a fast food company with 100 branches. The company’s sales target for each branch in March is at least RM 500 (in thousands). From a sample of 36 branches, the average sale in March is RM 485 (in thousands) with standard deviation of RM 32.4 (in thousands).
a. Can Susan infer that the company’s sales target has been met for March at 5% significance level?
b. Susan and her team introduced a new sales strategy in April to increase the sales in each branch. The total expenses of new strategy for each branch are RM 20 (in thousands). From a new sample of 21 branches, the average sale in April is RM 514 (in thousands) with standard deviation of RM 12.1 (in thousands). Is there enough evidence to say that the new strategy introduced in April is effective and profitable to the company at 5% significance level?
c. Based on the results in (b), what type of error could possibly occur? Explain the effect of this error to the fast food company.
QUESTION 3
For a certain year a study reports that the percentage of college students using credit cards was 83%. A college dean of student services feels that this is too high for her university, so she randomly selects 50 students and finds that 40 of them use credit cards. At α = 0.04, is she correct about her university?
QUESTION 4
A magazine article stated that the average age of women who are getting married for the first time is at most 26 years. A researcher decided to test this hypothesis at 2.5% significance level. She selected a sample of 25 women who were recently married for the first time and found the average was 25.1 years. The standard deviation was 3 years. Is the claim true?
QUESTION 5
A composition teacher wishes to see whether a new grammar program will reduce the number of grammatical errors her students make when writing a two-page essay. The data are shown here. At α = 0.01, can it be concluded that the number of errors has been reduced?
Errors before
12 9 0 5 4 3
Errors after
9 6 1 3 2 3
thank you,=)
Click here to see answer by Sarpi(32)  |
Question 594754: PLEASE HELP ME
A SEAMSTESS IS MEASURING A MODEL FOR A NEW DRESS. THE TAPE MESAURE IS MARKED IN CM. THE SEAMSTRESS NEEDS TO CONVERT THAT MEASURMENT INTO INCHES. IF THE MODELS WAIST MEASURMENT IS 65.4 CM, WHAT IS THE CONVERSOION IN INCHES?
Click here to see answer by Edwin McCravy(8909)  |
Question 595502: There are 991 people at the annual comic book convention. Sixty percent of the people at the convention are under 30 years old. Estimate the number of people at the convention who are under 30 years old.
Click here to see answer by edjones(7569)  |
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