The following exercise presents you with a fairly straightforward ratio and proportion situation. An advertisement says that 5 out of 8 dentists recommend the new zigzag toothbrush. If 256 dentists were interviewed, how many recommended the toothbrush? Estimate the answer and explain how you obtained the estimate

The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 80% confident that his estimate is within five percentage points of the true population percentage? Complete parts (a) through (c) below. a) Assume that nothing is known about the percentage of adults who have heard of the brand. n= 165 (Round up to the nearest integer.) b) Assume that a recent survey suggests that about 77% of adults have heard of the brand. n = (Round up to the nearest integer.)

23% of the students graduating from a local high school received scholarships to college. If 163 students graduating received scholarships to college, how many students total graduated from the local high school? You must show work and explain your estimation.  Estimation:  Exact answer:   (nearest whole number)

PROPORTIONS Sample Size: Calculate the sample size. A previous study showed that 69% of community college students have read a book for personal enjoyment during the school year. If a new study were to be done in order to reduce the margin of error to 1%, how many students should be sampled?

Rodney wants to test the relationship between college graduation rank and annual income. If income is measured on a ratio scale, the appropriate relationship test for Rodney to use is the: a. Spearman r b. Pearson r c. independent-samples t test d. chi square test of independence

Find the test statistic for a proportion "p" given the following information. Malloree ordered 15 pair of shoes online during the stay-at-home order, and 2 pairs arrived with mismatched sizes. Looking on line, she found that the retailer claimed that this happened 4% of the time with online orders. Enter your answer rounded to the thousandths place.

11 of 16 Angela has a monthly gross income of $3,000 and her expenses are $1,200. What is her back-end ratio? II

What does the margin of error for the estimate of a population proportion tell you?

Is parameter proportion the same as statistical proportion. so lets say the statistical proportion is 0.49. Would the parameter proportion be 0.49 as well ?

Solve the problem. At the Jumping Jack cookie factory, quality assurance inspectors remove broken or otherwise defective cookies from a moving conveyor belt prior to packaging. Based on past studies, the plant manager knows that the inspectors eliminate 98% of the defective cookies at a conveyor belt speed of 9 feet per minute. As the belt speed increases, the factory can produce more cookies per hour, but at the cost of lower quality of the packaged product. Inspectors collect only 60% of defective cookies at a belt speed of 18 feet per minute. QA Inspector Efficiency Inspector efficiency, % defective cookies eliminated 100 90 60 |(9.98) 50- 10 11 12 13 14 15 Belt speed, feet per minute (18,60) 16 17 18 a. Find an equation of the line through the given points. Write the equation in slope-intercept form. Round the slope and y-intercept each to 1 decimal place. b. Use the equation from part (b) to predict the efficiency of the inspectors at a belt speed of 15 feet per minute. Round to…