Over the last week the daily low temperatures in degrees Fahrenheit have been -4 , 6.2 , 18 1/2 , -5.9 , 21 , -1/4 , And 1.75.li
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Answer:
Step-by-step explanation:
We know that the sample size was:
The average was:
The standard deviation was:
The confidence level is
The confidence interval for the mean is:
Looking at the normal table we have to
Therefore the confidence interval for the mean is:
This means that <em>the mean planned spending of all Americans who take long summer vacations in 2009 is between $ 1024.69 and $ 1127.31</em>