What is the mean of the following set of data: 2 days, 7 days, 3 days, 4 days?
A data set consists of 8 values and has a mean of 227.5 gallons. Seven of the data values are as follows: 120 gallons; 280 gallons; 215 gallons; 325 gallons; 200 gallons; 135 gallons; 305 gallons. What is the 8th data value in the set?
The cafeteria worker surveyed students in the lunch line about what was their favorite kind of pizza. The workers decide to
survey the first 150 students that come into the cafeteria on Monday morning. Which of these best describes why this type of
sampling may give biased results?
Students are randomly selected.
The sample size is too small.
Not all students have the same chance to complete the survey.
Every other student entering the cafeteria should be surveyed.
In a recent survey of 160 people, 31% said that they spend at least $50 a day on everyday expenses. What is the margin of error for this survey?
(38.1, 106.9) represents the interval for 95% of the data. If μ = 72.5, find the standard deviation.