ory is based on a sample of 80 purchases, then should we conclude that this type of phone was getting less than half of the market at that time? ge a sample is needed for the 95% confidence interval for the population proportion to exclude 50%? onfidence interval for the parameter of interest is (OD). wo decimal places as needed.) conclude that this type of phone was getting less than half of the market at that time? e entire confidence interval is greater than 0.5, so we can conclude that this type of phone was getting more than half of the market. e confidence interval contains 0.5, so we can conclude that this type of phone was getting less than half of the market. e entire confidence interval is less than 0.5, so we can conclude that this type of phone was getting less than half of the market. e confidence interval contains 0.5, so we are unable to conclude that this type of phone was getting less than half of the market. ge a sample is needed for the 95% confidence interval for the population proportion to exclude 50%?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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A newspaper reported that 45% of smartphone purchases made by people with incomes between $35,000 to $50,000 were a certain kind of phone.
(a) If the story is based on a sample of 80 purchases, then should we conclude that this type of phone was getting less than half of the market at that time?
(b) How large a sample is needed for the 95% confidence interval for the population proportion to exclude 50%?
.....
The 95% confidence interval for the parameter of interest is
(Round to two decimal places as needed.)
Should we conclude that this type of phone was getting less than half of the market at that time?
O A. The entire confidence interval is greater than 0.5, so we can conclude that this type of phone was getting more than half of the market.
O B. The confidence interval contains 0.5, so we can conclude that this type of phone was getting less than half of the market.
OC. The entire confidence interval is less than 0.5, so we can conclude that this type of phone was getting less than half of the market.
D. The confidence interval contains 0.5, so we are unable to conclude that this type of phone was getting less than half of the market.
(b) How large a sample is needed for the 95% confidence interval for the population proportion to exclude 50%?
n=
(Round up to the nearest integer.)
Transcribed Image Text:A newspaper reported that 45% of smartphone purchases made by people with incomes between $35,000 to $50,000 were a certain kind of phone. (a) If the story is based on a sample of 80 purchases, then should we conclude that this type of phone was getting less than half of the market at that time? (b) How large a sample is needed for the 95% confidence interval for the population proportion to exclude 50%? ..... The 95% confidence interval for the parameter of interest is (Round to two decimal places as needed.) Should we conclude that this type of phone was getting less than half of the market at that time? O A. The entire confidence interval is greater than 0.5, so we can conclude that this type of phone was getting more than half of the market. O B. The confidence interval contains 0.5, so we can conclude that this type of phone was getting less than half of the market. OC. The entire confidence interval is less than 0.5, so we can conclude that this type of phone was getting less than half of the market. D. The confidence interval contains 0.5, so we are unable to conclude that this type of phone was getting less than half of the market. (b) How large a sample is needed for the 95% confidence interval for the population proportion to exclude 50%? n= (Round up to the nearest integer.)
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