College Algebra
7th Edition
ISBN: 9781305115545
Author: James Stewart, Lothar Redlin, Saleem Watson
Publisher: Cengage Learning
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Chapter A, Problem 8E
To determine
To find:
The value of expression
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- P-value A medical researcher tested a new treatment forpoison ivy against the traditional ointment. He concludedthat the new treatment is more effective. Explain what theP-value of 0.047 means in this context.arrow_forwardElderly drivers. A polling agency interviews 875 American adults and finds that 560 think licensed drivers should be required to retake their road test once they reach 65 years of age. Round all answers to 4 decimal places. I need help with 4 and 6arrow_forwardWidows A recent study indicated that 23% of the 119 women over age 55 in the study were widows. Round up your answers to the next whole number for the following questions. How large a sample must you take to be 90% confident that the estimate is within 0.02 of the true proportion of women over age 55 who are widows? I got n=1198, which is incorrect.arrow_forward
- You are a crime scene investigator trying to match the lead content of bullet fragments found at a crime scene to the lead content of a box of bullets found with a suspect. To simplify this question, assume that the instrument you use gives you one measurement per fragment in grams/cm3. Assume that you have 5 measurements from fragments found at the crime scene and 7 measurements from bullets found with the suspect. (d) You run the analysis and the p-value is 0.9, α = 0.001 and β = 0.01. If you fail to reject H0, What is the probability that you made the wrong decision in this case? (e) Under what conditions could an expert witness give the following statement based solely on lead bullet statistical evidence: “The bullet fragments must have come from the same box or from another box that would have been made by the same company on the same day.”arrow_forward23% of people mind if others smoke near a building entrance. A researcher thinks it has decreased.You decide to survey 100 adult Americans and find that 51 of people mind if others smoke near a building entrance. Find the test statistic. Round to two decimal places.z=c) What is the p-value? Round to 4 decimals.p=arrow_forwardWidows A recent study indicated that 37% of the 123 women over age 55 in the study were widows. Round up your answers to the next whole number for the following questions. How large a sample must you take to be 95% confident that the estimate is within 0.05 of the true proportion of women over age 55 who are widows? n=arrow_forward
- Claim: Fewer than 98% of adults have a cell phone. In a reputable poll of 1002 adults, 90% said that they have a cell phone. Find the value of the test statistic.The value of the test statistic is? (Round to two decimal places as needed.arrow_forwardHomework Guide Given P(A) = 0.41, P(A and B) = 0.34, P(A or B) = 0.45, what is P(B)? Answer in decimal form. Round to 2 decimal places as needed.arrow_forwardWidows A recent study indicated that 23% of the 119 women over age 55 in the study were widows. Round up your answers to the next whole number for the following questions. How large a sample must you take to be 90% confident that the estimate is within 0.02 of the true proportion of women over age 55 who are widows?arrow_forward
- A security camera pulled the following image below of a silhouette of a suspected criminal passing by a desk during the crime. On the picture print-out itself, you've made the measurements shown in the image. A brand-name is visible on the desk, and after a thorough online search, you find that the specific desk model is 36 inches tall. How tall is the suspect, in inches?arrow_forwardHi, can i get some help with the question below please. Calculation steps and explanations Let p equal the proportion of drivers who use a seat belt in a state that does not have a mandatory seat belt law. It was claimed that p = 0.14. An advertising campaign was conducted to increase this proportion.Two months after the campaign, y = 104 out of a random sample of n = 590 drivers were wearing seat belts. Was the campaign successful? (Use α = 0.01.)arrow_forwarda) find the x-value that has 45% of the area below it b) fing the x-value that has 13% of the area above it This question is about z score. Please include how did you find the x value. Also, explain the z score table upon finding the value of xarrow_forward
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