3. a medical researcher wants to estimate the survival time of a patient after the onset of

a particular type of cancer and after a particular regimen of radiotherapy. a. what is the

variable of interest to the medical researcher? (1 point)

b. is the variable in part a qualitative, quantitative discrete, or quantitative

continuous? (1 point)

Which expression is equivalent to -5(3x - 6/7)

A. what does the point (4, 122) represent? b. what is the unit rate? c. what is the cost of buying 10 tickets?

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)?