Question

In: Statistics and Probability

One feature smartphone manufacturers use in advertising is the amount of time one can talk before...

One feature smartphone manufacturers use in advertising is the amount of time one can talk before recharging the battery. Below are 13 values from a random sample of the talk-time (in minutes) of smartphones running on lithium-ion batteries. The summary statistics are x bar=554.15, s=224.86, Q1=402, Median 451,Q3=680.

316 374 789 1039 865 374 521 402 402 680 402 451

a. Construct an appropriate graph to describe the shape of the distribution.
b.. Determine the 95% confidence interval for the population mean
upper limit____(Round to two decimal places as needed.)
lower limit____(Round to two decimal places as needed.)

c. The dot plot shows that the 1071 observations is quite a bit larger than the others. Deleting this observation, find the mean and standard deviation, and construct the 95% confidence interval for μ.

x bar=___(Round to two decimal places as needed.)
s=___(Round to two decimal places as needed.)

Construct the 95% confidence interval for
μ.

upper limit____(Round to two decimal places as needed.)
lower limit____(Round to two decimal places as needed.)

Solutions

Expert Solution

a)In given summary statistics mean is greater than median so distribution will be right skewed.

b)

c)

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orchestra answered 2 years ago
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