Many smartphones, especially those of the LTE-enabled persuasion, have earned a bad rap for exceptionally bad battery life. Battery life between charges for the Motorola Droid Razr Max averages 20 hours when the primary use is talk time and 7 hours when the Internet applications (The wall Street Journal, March 7, 2012). Since the mean hours for talk time usage is greater than the mean hours for Internet usage, the question was raised as to whether the variance in hours of usage is also greater when the primary use Sample data showing battery hours of use for the two applications follows:
Primary use talking:
35.8 22.2 4.0 32.6 3.5 42.5
8.0 3.8 30.0 12.8 10.3 35.5
Primary use Internet:
24.0 12.5 36.4 1.9 9.9
5.4 1.0 15.2 4.0 4.7
a. Formulate hypotheses about the two population variances that can be used to determine if the population variance in battery hours of use is greater for the talk time application.
H1:σ21
Ha:σ22
b. What are the standard deviations of battery hours of use for the two samples? Round your answers to two decimal places.
S1
S2
c. Conduct the hypothesis test and compute the p-value.
- The value of
- P-value is

Null hypothesis: the variance in hours of usage for talking is not greater than the the variance in hours of usage for internet.

:

Alternative hypothesis: the variance  in hours of usage for talking is  greater than the the variance in hours of usage for internet.

Step-by-step explanation:

Let and be the two variables that represents the battery life in hours for talking usage and battery life in hours for internet usage respectively.

The hypothesis can be formulated as:

Null hypothesis: the variance in hours of usage for talking is not greater than the the variance in hours of usage for internet.

:

Alternative hypothesis: the variance  in hours of usage for talking is  greater than the the variance in hours of usage for internet.

The standard deviation for the battery usage for talking is :

The standard deviation Is:

The standard deviation for the battery life usage for the internet is :

Thus; the standard deviation is:

maximum area = xy = (16)(32) = 512 ft2

to maximize the area of the garden, the side of the fence parallel to the side of the house should be 32 ft long, and the other two sides should both have length 16 ft.'

source

no he doesnt because "-16' is negatiive

step-by-step explanation: