Determine whether the situation calls for a survey, an observational study, or an experiment.

you want to find out if a new reading program can increase reading comprehension.

a. experiment

b. observational study

c. survey

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

What is the y-intercept of the line with the equation 3x + 4y = 12?