proportions

A researcher would like to estimate the proportion of all mothers who take black coffee during pregnancy. She would like to be 90% confident that the estimate is within 2.5 percentage points of the true proportion. What sample size is required? => 0.574 or 0.109 or 1,089 or 2,17..

4 books cost $5. Use proportions to find the cost of 28 books. => $35 or $31 or $39 or none of the above..

Joe bought 3 pizzas for $2.5. How much will he have to pay to buy 6 pizzas. Use proportions to find the amount. => $5 or $4 or $6 or $15..

Identify the pair of proportions that are equivalent to the ratio 24 : 40? => 3 / 10 and 6 / 20 or 3 / 5 and 12 / 20 or 2 / 0 and 4 / 0 or None of the above..

A survey revealed that the extent to which the proportion of dental students use the internet to retrieve information for dental topics is 32%. How many dental students should be surveyed to estimate the true proportion of students who use internet with 99% confidence interval 4..

In a class 50 out of 63 students are interested in mathematics and in another class it is 40 out of 56. Find the test value and verify if the proportions differ significantly at 95% confidence. => 16.88, the proportions differ or 1.96, the proportions do not differ or ..

Sam bought 2 pizzas for $1.5. How much does he pay to buy 4 pizzas? Use proportions to find the amount. => $4 or $3 or $6 or $2..

Charlie bought 3 pizzas for $2.5. How much does he pay to buy 6 pizzas? Use proportions to find the amount. => $15 or $4 or $5 or $6..

The number of females working in a company is 200 out of 500 and that of another company is 350 out of 600. Do both the proportions differ significantly at 90% and 99% confidence levels? => differ at 90% and do not differ at 99% or do not differ at both 90% and 99% or differ at both 90% a..

The number of females in a class is 26 out of 65 and in that school is 314 out of 748. Check whether the proportions differ at 95% and 99% confidence levels or not. => do not differ at 95% and at 99% or do not differ at 95% and differ at 99% or differ at 95% and do not differ at 99% or di..