The San Francisco Bay Area Rapid Transit (BART) system conducted a survey to learn if bikes on board would have any effect on riders. A random sample of riders was selected and asked if there was enough room for bikes and passengers. Of the 1720 riders selected, 671 indicated there was enough room and 327 said it would be too crowded.2
a. Find a point estimate for the proportion of all BART riders who believe there is enough room for passengers and bikes.
b. Find a point estimate for the proportion of all BART riders who believe it is too crowded with bikes on board.
c. Let pd denote the difference in population proportions between all BART riders who believe there is enough room for passengers and bikes and all BART riders who believe it is too crowded. Find a point estimate for pd
Merck recently released an experimental insomnia drug, suvorexant. This drug temporarily blocks chemical messengers that work to keep people alert and awake.3 The new pill seems to work but does have some potential harmful side effects, for example, extended daytime drowsiness. A random sample of patients taking this experimental drug was obtained. The dosage in milligrams was recorded for each patient.
a. Find a point estimate for the mean dosage.
b. Find a point estimate for the variance of the dosage.
c. Find a point estimate for the first quartile and a point estimate for the third quartile.
In March 2013, the 17 ambulances in Manatee County, Florida, responded to 3645 calls.4 The response time is measured from the time the ambulance is notified of the call until the crew arrives on the scene. A random sample of the March response times was obtained.
a. Find a point estimate for the minimum response time.
b. Find a point estimate for the maximum response time. c. Find a point estimate for the interquartile range of response times.