The number of hours spent on social media during a one-week period was recorded for a random sample of 45 university students. For these 45 students, the mean number of social media hours was 12.52, with a standard deviation of 2.5. Researchers want to determine if the mean number of hours that all university students spend on social media each week is greater than 12, with a 5% level of significance.
What is the value of the t statistic?
What is the p value?
Solution :
= 12
=12.52
S =2.5
n = 45
This is the right tailed test .
The null and alternative hypothesis is ,
H0 : = 12
Ha : > 12
Test statistic = t
= ( - ) / S / n
= (12.52- 12) / 2.5 / 45
= 1.395
Test statistic = t = 1.395
P-value =0.0850
= 0.05
P-value ≥
0.0850 ≥ 0.05
Do not reject the null hypothesis .
There is insufficient evidence to suggest that
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