Question

Calculate the upper and lower limit for a 95% confidence interval about this mean.

A family needs a new car, but isn't sure they can fit the payment into their budget. A sample of 36 months of grocery bills yields a mean of $94 with a standard deviation of $10. If the upper limit of a 95% confidence level is below $100, the family can afford to buy the car.

Standard error = (standard deviation)/(square root of sample size)

Upper limit (dollars and cents)

Lower limit (dollars and cents)

Answer 1

are there any answer choices??

Answer 2

idek how to do this

Answer 3

no there are none

Answer 4

\(\color{#0cbb34}{\text{Originally Posted by}}\) @lakea
idek how to do this
\(\color{#0cbb34}{\text{End of Quote}}\)
kmsl i rlly dont either but ill try nd help

Answer 5

95% confidence interval for population mean is

Sample mean +/- z-score for 95% confidence*Standard deviation/sqrt sample size

94 +/- 1.96*10/sqrt 36

94 +/- 3.27

Lower limit is 94 - 3.27 = $90.73

Upper limit is 94 + 3.27 = $97.27

Since the upper limit is below $100, the family can afford to buy the car.

Answer 6

thank you zombie

Answer 7

no pronlem !

Answer 8

Can you close the Question?