1. A survey of 2293 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 407 have donated blood in the past two years.

Construct and interpret a 90% confidence interval for the population proportion of adults in the country who have donated blood in the past two years. Select the correct choice below and fill in any answer boxes within your choice.

(Type integers or decimals rounded to three decimal places as needed. Use ascendingorder.)

We are ____ confident the proportion of adults in the country aged 18 and older who have donated blood in the past two years is between __ and __.

2.A random sample of 1009 adults in a certain large country was asked"Do you pretty much think televisions are a necessity or a luxury you could dowithout?" Of the 1009 adultssurveyed, 518 indicated that televisions are a luxury they could do without.

Verify that the requirements for constructing a confidence interval about p are satisfied.

The sample is stated to be a simple random sample, the value of np = (1-p) is _________, which is greater than or equal to 10, and the sample size can be assume to be less than or equal to 5% of the population size.

Construct and interpret a 95% confidence interval for the population proportion of adults in the country who believe that televisions are a luxury they could do without. Select the correct choice below and fill in any answer boxes within your choice.

(Type integers or decimals rounded to three decimal places as needed. Use ascendingorder.)

We are ____ confident the proportion of adults in the country aged 18 and older who have donated blood in the past two years is between __ and __.

Is it possible that a supermajority(more than60%) of adults in the country believe that television is a luxury they could dowithout? Is itlikely?

A researcher wishes to estimate the proportion of adults who havehigh-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.05 with 90% confidence if

(a) she uses a previous estimate of 0.58?

(b) she does not use any priorestimates?