A simple random sample of 400 households is taken in a large city, and the number of cars in each sampled household is noted. The average number of cars in the sampled households is 1.8 and the SD is 1.3. Among the sampled households, 10% had no car.
PROBLEM 5
This problem is worth 1 point
An approximate 90% confidence interval for the average number of cars among households in the city goes from _____________________ to _______________________.

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90% is the interval -1.645 to +1.645

Just work on this: 1.8 -+ 1.645 * (1.3/sqr400)

it is wrong .. 1.3 SE

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