Question

In a sample of 40 individuals, it is found that the average amount spent on groceries per month is $255. From previous studies, it is assumed that the population standard deviation is $46. Find a 95% confidence interval for the average amount of money spent on groceries per month, and interpret your result.

Use ??=1.96 for 95% confidence, and round your answers to 2 decimal places.

The confidence interval is:

$________

to

$________

This means:

Select your answer from one of the following options.

• a.95% of the 40 individuals in the sample spent between _____ and _____ on groceries.
• b.95% of individuals spend between _____ and _____ on groceries.
• c.We know for sure that the population mean for amount spent on groceries is between _____ and _____.
• d.We can be 95% confident the population average for amount spent on groceries is between _____ and _____.

Answer 1

This means: