(b) Within what interval would you expect the sample mean 95 percent probability? (Round your answers to 4 decimal The interval is from to

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Find the interval
The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder
3.5-L automatic 5-speed using premium fuel is a normally distributed
random variable with a mean of p = 21.50 mpg and a standard deviation
of o = 2.75 mpg.
(a) What is the standard error of X , the mean from a random sample o
9 fill-ups by one driver? (Round your answer to 4 decimal placesY
Standard error of X
.9167
(b) Within what interval would you expect the sample mean to fall, v
95 percent probability? (Round your answers to 4 decimal places
The interval is from
to
to
2015833
22.4167
Transcribed Image Text:The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a normally distributed random variable with a mean of p = 21.50 mpg and a standard deviation of o = 2.75 mpg. (a) What is the standard error of X , the mean from a random sample o 9 fill-ups by one driver? (Round your answer to 4 decimal placesY Standard error of X .9167 (b) Within what interval would you expect the sample mean to fall, v 95 percent probability? (Round your answers to 4 decimal places The interval is from to to 2015833 22.4167
Expert Solution
Step 1

To find the range we use confidence interval, the minimum valuer is lower value and the maximum value is the upper value. The boundary-value of the confidence interval is called as confidence limit.

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