Part 1

The included data set contains mobile commerce penetration values (the percentage of the country population that bought something online via a mobile phone in the past month) for 22 of the world's economies. Complete parts (a) through (c) below.

a. Construct a 99% confidence interval estimate for the population mean mobile commerce penetration.

(Type integers or decimals rounded to two decimal places as needed.)

Part 2b. What assumption do you need to make about the population to construct the interval in (a)?Choose the correct answer below.

A.

The populations of the sampled countries follow the t distribution.

B.

The populations of the sampled countries are normally distributed.

C.

The mobile commerce penetration follows the t distribution.

D.

The mobile commerce penetration is normally distributed.

Part 3c. Given the data presented, do you think the assumption needed in (a) is valid? Explain.

A.

The condition is violated because the data is left skewed.

B.

The condition appears to be met, indications are that the data is symmetric and closely follows a t distribution.

C.

The condition appears to be met, indications are that the data is symmetric and closely follows a normal distribution.

D.

The condition is violated because the data is right skewed.

Country	Mobile Commerce Penetration (%)
Belgium	38
Brazil	43
Canada	33
Denmark	51
Finland	49
France	39
Germany	50
Italy	41
Japan	55
Netherlands	49
New Zealand	44
Norway	57
Poland	33
Russia	30
South Korea	47
Spain	48
Sweden	60
Switzerland	43
Taiwan	42
Turkey	46
United Kingdom	55
United States	39