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section 6.2, stats (help with TI-84 calculator is possible)
The gas mileages (in miles per gallon) of
23
randomly selected sports cars are listed in the accompanying table. Assume the mileages are not
90%
confidence interval for the population
Here are the sports car mileage averages: 19,28,19,17,20,22,16,24,27.20,18,26,25,24,18,16,20,22,20,18,24,19,17
Let standard deviation stand for population standard deviation and let n be the sample size. which distribution should be used to construct the confidence interval?
1) A (t-distribution, the standard normal distribution should, or neither distribution can) be used to construct the confidence interval, since 2) is (stanard dev. and n greater than or equal to 10., standard is unknown and the population is not normally distributed., standard dev. is unknown., standard dev. is unknown and n<30., standard dev. is known and the population is not normally distributed., standard dev. is known and n<30., standard dev. is known and n> or equal to 10., the population is not normally distributed and n<30. OR the population is not normally distributed and n> or equal to 10.)
Identify the confidence interval. Select the correct choice below and if necessary, fill in the answer box to complete your choice.
A. (____________ , ______________) (round to one decimal place)
B. Neither the standard normal distribution nor the t-distribution can be used to construct the interval.
Interpret the results. Select the correct choice below and if necessary fill in the answer box to complete your choice.
A. With ____________ % confidence, it can be said that the mean gas mileage of all sport cars (in miles per gallon) (type an integer or a decimal, do not round)
B. With _____________ % confidence, it can be said that most sports cars in the population have gas mileages......(type on integer or a decimal, do not round)
C. It can be said that ________% of all sports cars have a gas mileage (in miles per gallon) that is between ........... (type an integer or a decimal, do not round)
D. ___% of all random samples of 23 sports cars from the population of all sports cars will have a ............ between the intervals endpoints.
(type an integer or a decimal do not round)
E. Neither the standard normal distribution nor the t-distribution can be used to construct the interval.
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