In a random sample of 20 people, the mean commute time to work was 31.7 minutes and the standard deviation was 7.3 minutes. assume the population is normally distributed and use a t-distribution to construct a 95% confidence interval for the population mean mu. what is the margin of error of mu? interpret the results.

Solution: We are given:

x bar=31.7

s = 7.3

n=20

The 95% confidence interval for the population mean is given below:

xbar +-

31.7 +- (2.093 x )

31.7 +- 3.42

[31.7-3.42,31.7+3.42]

[28.28 ,35.12 ]

Therefore the 95% confidence interval for the population mean is:

28.28≤μ≤35.12

The margin of error is 3.42

There is 95% chance that the confidence interval 28.28≤μ≤35.12 contains the true population mean.

£56

step-by-step explanation:

u divide 24 by 3 and u get 8 so if u do 8 time 7 or 8+8+8+8+8+8+8 u get 56 and 56 divided by 7 is 8.

part d

step-by-step explanation:

theresa talked her parents into getting sd cards for her phone and her brother’s phone. inserting an sd card into a phone gives it more storage. they both get 8-gigabyte sd cards. how many bits of storage come with each sd card? type your answer in both scientific and standard notation.