According to a recent survey, americans get a mean of 7 hours of sleep per night. a random sample of 50 students at west virginia university revealed the mean length of time slept last night was 6 hours and 48 minutes (6.8 hours). the standard deviation of the sample was 0.9 hours.
at the 5% level of significance, is it reasonable to conclude that students at west virginia sleep less than the typical american?

At the 5% level of significance,  it is not reasonable to conclude that students at West Virginia sleep less than the typical American

Step-by-step explanation:

Given that according to a recent survey, Americans get a mean of 7 hours of sleep per night. A random sample of 50 students at West Virginia University revealed the mean length of time slept last night was 6 hours and 48 minutes (6.8 hours). The standard deviation of the sample was 0.9 hours.

n =50

Std error =

Since sample std dev is only known, we can use t test.

(left tailed test at 5% level)

Mean difference = -0.12

Test statistic t = mean diff/std error = -0.9429

p value for t test with d f= 49 is 0.175

Since p>alpha we accept null H0

At the 5% level of significance,  it is not reasonable to conclude that students at West Virginia sleep less than the typical American

step-by-step explanation:

where is the question is there is a formula or is there not one

step by step explanation: when u removing the parentheses and combined them that would be : x+3y-x-y=2y