Standard Deviation Question.... & finding the test value?

A recent gasoline survey said that the national average gasoline price was $1.298 a gallon. It was felt that gasoline in Texas was significantly lower than the national average. A survey of 7 different suburbs in Dallas, Texas, found the average price of gasoline to be $1.192 a gallon with a standard deviation of $0.0436. What is the test value?











a. -4.38





b. -5.41





c. -6.19





d. -6.43





e. -7.59





f. -10.7





g. none of these

Standard Deviation Question.... %26amp; finding the test value?
hi,


test static t = x - mue / standard deviation * root n





x = $1.192 , mue = $1.298 , n = 7 , standard deviation = $0.0436





t = 1.192 - 1.298 / 0.0436 * root 7 =


- 6.43


option d .





if u still have any doubts or any problems to be solved contact me.


thankyou
Reply:d. -6.43


T-Test: t=-6.432331, p=0.0003337485