A researcher wants to test whether there is a difference in the average number of hours high schoolers and college students spend on their phones. They have samples of 40 high schoolers and 40 college students and an approximate number of hours the students spend on their phones every day. What test should the researcher use?

If benito is selecting samples of five values from the table, which row will result in the greatest mean? row 1 row 2 row 3 row 4

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?

Cuántos triángulos forman un diamante