Each person in a random sample of 228 male teenagers and a random sample of 303 female teenagers was asked how many hours he or she spent online in a typical week. The sample mean and standard deviation were 15.3 hours and 11.3 hours for males and 14.1and 11.8 for females. (Use a statistical computer package to calculate the P-value. Use ?males − ?females. Round your test statistic to two decimal places, your df down to the nearest whole number, and your P-value to three decimal places.) t =   df =   P =   Is there enough evidence to show that mean number of hours spent online in a typical week is greater for male teenagers than for female teenagers? Use a 0.05 significance level. Yes No

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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Each person in a random sample of 228 male teenagers and a random sample of 303 female teenagers was asked how many hours he or she spent online in a typical week. The sample mean and standard deviation were 15.3 hours and 11.3 hours for males and 14.1and 11.8 for females. (Use a statistical computer package to calculate the P-value. Use ?males − ?females. Round your test statistic to two decimal places, your df down to the nearest whole number, and your P-value to three decimal places.)

t =  
df =  
P =  


Is there enough evidence to show that mean number of hours spent online in a typical week is greater for male teenagers than for female teenagers? Use a 0.05 significance level.

Yes
No    

 

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