An investment website can tell what devices are used to access the site. The site managers...

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An investment website can tell what devices are used to accessthe site. The site managers wonder whether they should enhance thefacilities for trading viaâ€‹ \"smart phones\", so they want toestimate the proportion of users who access the site that wayâ€‹(even if they also use their computersâ€‹ sometimes). They draw arandom sample of
200200
investors from their customers. Suppose that the true proportionof smart phone users is
3737â€‹%.
â€‹a) What would the standard deviation of the samplingdistribution of the proportion of the smart phone usersâ€‹ be?
. 034.034
â€‹(Round to three decimal places asâ€‹ needed.)
â€‹b) What is the probability that the sample proportion of smartphone users is greater than
0.370.37â€‹?
. 5.5
â€‹(Round to three decimal places asâ€‹ needed.)
â€‹c) What is the probability that the sample proportion isbetween
0.320.32
and
0.420.42â€‹?
. 858.858
â€‹(Round to three decimal places asâ€‹ needed.)
â€‹d) What is the probability that the sample proportion is lessthan
0.300.30â€‹?
. 02.02
â€‹(Round to three decimal places asâ€‹ needed.)
â€‹e) What is the probability that the sample proportion isgreater than
0.440.44â€‹?
______
â€‹(Round to three decimal places asâ€‹ needed.)

Answer & Explanation Solved by verified expert

4.4 Ratings (827 Votes)

n200 is the sample sizep037 is the true proportion of smart phone usersa the standard deviation also called the standard error ofthe sampling distribution of the proportion of the smart phoneusers isans the standard deviation also See Answer

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