Sorry guys, but I need a step by step answer to how I am supposed to work this out:
We wish to see if, on average, traffic is moving at the speed limit (65km/h). On each of four randomly selected days, a randomly selected car is timed and the speed of the car is recorded. The observed speeds are 70, 65, 70 and 75 km/h. Assuming that speeds are Normally distributed with mean µ , we test whether, on average, traffic is moving at 65km/h by testing the hypoth:
H0 (null hypoth): µ = 65, Ha (alt hypoth): µ ? 65.
Based on the data, the value of the one-sample t statistic is:
a) 5
b) 4.9
c) 2.45
d) 1.23
here is the t-table we will have:
http://www.siliconfareast.com/t-dist.htm
...and i couldn't make sense of the explanation page.
We wish to see if, on average, traffic is moving at the speed limit (65km/h). On each of four randomly selected days, a randomly selected car is timed and the speed of the car is recorded. The observed speeds are 70, 65, 70 and 75 km/h. Assuming that speeds are Normally distributed with mean µ , we test whether, on average, traffic is moving at 65km/h by testing the hypoth:
H0 (null hypoth): µ = 65, Ha (alt hypoth): µ ? 65.
Based on the data, the value of the one-sample t statistic is:
a) 5
b) 4.9
c) 2.45
d) 1.23
here is the t-table we will have:
http://www.siliconfareast.com/t-dist.htm
...and i couldn't make sense of the explanation page.