Eric wants to estimate the percentage of elementary school children who have a social media account. He surveys 450 elementary school children and finds that 280 have a social media account.

Identify the values needed to calculate a confidence interval at the 99% confidence level. Then find the confidence interval.

Use the table of common z-scores above.

• Round the final answer to three decimal places.

You just purchased an investment at a price of $1250. You will receive $1900 at the end of 8 years. If the interest rate is compounded semi-annually, what is your yield to maturity? Do not write any symbol (%, $, #, &,...). Express your answers as a percentage. Round your answer to the nearest one-hundredth percentage point. For example, write 12.56 for 12.56%.

General Motors 2019-2020

Use the bulleted format to list the company's segments/product lines and the percent each segment contributes to sales/revenues. Segment data should be reported in percentage terms. Note: You may need to convert dollar data to percentages. Remember to check that the percentage for all segments combined is 100 percent.

A publisher reports that 25% of their readers own a laptop. A marketing executive wants to test the claim that the percentage is actually above the reported percentage. A random sample of 100 found that 30% of the readers owned a laptop. Is there sufficient evidence at the 0.10 level to support the executive's claim?

Determine the ?-value of the test statistic. Round your answer to four decimal places.

Which if the following statements about weak acids is correct?

Weak acids always contain C atoms

The percentage dissociation for weak acids is usually in the range if 40-60 percent

Weak acids molecules readily lose only a small percentage of their acidic hydrogen atoms

more than one correct response

No correct response

Describe briefly the following method of Out of Sample forecast criterion
1... Root Mean Square error
2...Mean absolute error
3...Mean absolute percentage error
4...Maximum Absolute Error
5...Maximum Absolute Percentage error.

Write down their formulae and discuss briefly how you interpret them

1. Set up an amortization schedule for a $30,000 loan to be repaid in equal instalments at the end of each of the next 3 years. The interest rate is 3 percent, compounded annually.

   A. What percentage of the payment represents interest payment and what percentage of the payment represents principal payment for each of the 3 years?B.Why do these percentages change over time?

A publisher reports that 34% of their readers own a particular make of car. A marketing executive wants to test the claim that the percentage is actually different from the reported percentage. A random sample of 220 found that 30% of the readers owned a particular make of car. Determine the P-value of the test statistic. Round your answer to four decimal places