Name Date
15.1 Percents and Decimals
For use with Activity 15.1
Essential Question How does the decimal point move when you rewrite
a percent as a decimal and when you rewrite a decimal as a percent?
1 ACTIVITY: Writing Percents as Decimals
Work with a partner. Write the percent shown by the model. Write the
percent as a decimal.
per
cent
Simplify
Write fraction as a decimal
b.
c.
d.
e.
Hi

Abottled water distributor wants to estimate the amount of water contained in 1-gallon bottles purchased from a nationally known water bottling company. the water bottling company’s specifications state that the standard deviation of the amount of water is equal to 0.02 gallon. a random sample of 50 bottles is selected, and the sample mean amount of water per 1-gallon bottle is 0.995 gallon a. construct a 99% confidence interval estimate for the popula-tion mean amount of water included in a 1-gallon bottle. b. on the basis of these results, do you think that the distributor has a right to complain to the water bottling company? why? c. must you assume that the population amount of water per bottle is normally distributed here? explain. d. construct a 95% confidence interval estimate. how does this change your answer to (b)?