A negative value of z indicates that a. the number of standard ...

[fagboi]

A negative value of z indicates that
 a. the number of standard deviations of an observation is to the right of the mean.
   b. the number of standard deviations of an observation is to the left of the mean.
   c. a mistake has been made in computations, since z cannot be negative.
   d. the data has a negative mean.

Question 2

A sample of 61 items provided a sample mean of 932, a sample mode of 900, and a sample standard deviation of 11 . Test the following hypotheses using  = .05 . What is your conclusion? H0: 2  80 Ha: 2 > 80

[Jayson]

Answer to Question 1

b

Answer to Question 2

2 = 90.75 > 79.082 (p-value is between .005 and .01); reject H0
The population variance is more than 80.

[fagboi]

Wow, this really help

[aliotak]

Gracias!