I need some help on these. this is due tomorrow and my teacher showed me how to do them but i still didn't understand how to do
them. please help me
1 answer:
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Answer:
The point of estimate for the true difference would be:
And the confidence interval is given by:
Step-by-step explanation:
For this case we have the following info given:
the sample mean for the first sample
the sample mean for the second sample
the sample deviation for the first sample
the sample deviation for the second sample
the sample size for the first group
the sample size for the second group
The confidence interval for the true difference is given by:
We can find the degrees of freedom are given:
The confidence level is given by 90% so then the significance would be and
we can find the critical value with the degrees of freedom given and we got:
The point of estimate for the true difference would be:
And replacing into the formula for the confidence interval we got: