b) Probability greater than 0.31 :
= P ( p - p / standard deviation > 0.31 - 0.31 / 0.027 )
= P ( z > 0)
Using the standard normal table
p = 0.500
Question Help An investment website can tell what devices are used to access the site. The site managers wonder whether they should enhance the facilities for trading via smart phones', so th...
An investment website can tell what devices are used to access the site. The site managers wonder whether they should enhance the facilities for trading via "smart phones", so they want to estimate the proportion of users who access the site that way (even if they also use their computers sometimes). They draw a random sample of 100 investors from their customers. Suppose that the true proportion of smart phone users is 38%. d) What is the probability that the...
An investment website can tell what devices are used to access the site. The site managers wonder whether they should enhance the facilities for trading via "smart phones", so they want to estimate the proportion of users who access the site that way (even if they also use their computers sometimes). They draw a random sample of 200 investors from their customers. Suppose that the true proportion of smart phone users is 34 %. What is the probability that the...
An investment website can tell what devices are used to access the site. The site managers wonder whether they should enhance the facilities for trading via "smart phones," so they want to estimate the proportion of users who access the site that way (even if they also use their computers sometimes). They draw a random sample of 200 investors from their customers. Suppose that the true proportion of smart phone users is 37%. Complete parts a through c below. b)...
An investment website can tell what devices are used to access their site. The site managers wonder whether they should enhance the facilities for trading via smartphones so they want to estimate the proportion of users who access the site that way. They draw a random sample of 428 investors from their customers. Suppose that the true proportion of smartphone users is 39%. Complete parts a) through c) below. a) What would the managers expect the shape of the sampling...