EBK BUSINESS STATISTICS
7th Edition
ISBN: 8220102743984
Author: STEPHAN
Publisher: PEARSON
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A researcher wonders whether younger mothers have babies that are significantly heavier or
lighter than the population average of μ 7.25 pounds. The researcher collects data from N
= 35 babies who were born to mothers between the ages of 16 and 18. The average weight
for these babies was M = 7.15 pounds (SD = .6 pounds).
An ectopic pregnancy is twice as likely to develop when the pregnant woman is a smoker as it is when she is a nonsmoker. If 32 percent of women of child bearing age are smokers, what percentage of women having ectopic pregnancies are smokers?
The head of a computer science department is interested in estimating the proportion of students entering the department who will choose the new computer engineering option. A preliminary sample indicates that the proportion will be around 0.35. Therefore, what size sample should the department head take if she wants to be 95% confident that the estimate is within 0.10 of the true proportion?
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- Find the mean hourly cost when the cell phone described above is used for 240 minutes.arrow_forwardAn Ectopic Pregnancy is twice as likely to develop when the pregnant women is a smoker as it is when she's a nonsmoker. If 32 percent of women of childbearing age are smokers, what percentage of women having Ectopic Pregnancy are smokers?arrow_forwardAn auto-parts store offers a fuel additive that claims to increase a vehicle’s gas mileage. The additive is poured into a vehicle’s gasoline tank after the tank is filled. To measure the claim, two methods to collect data are proposed.arrow_forward
- The recidivism rate for convicted sex offenders is 8%. A warden suspects that this percent is different if the sex offender is also a drug addict. Of the 321 convicted sex offenders who were also drug addicts, 22 of them became repeat offenders. What can be concluded at the a = 0.01 level of significance?arrow_forwardA packaging company fills bags so that each bags has an average weight of 250 grams. The owners take a sample of bags and records the weight (grams) of each. They found the following information: Five-Number Summary (in grams) Min 213.97 Q1 236.34 Q2 244.1 Q3 255.47 Max 272.5 75% of bags weigh more than which amount?arrow_forwardIn a study at The Ohio State University, 16 student volunteers drank a randomly assigned number of cans of beer. Thirty minutes later, a police officer measured their blood alcohol content (BAC) in grams of alcohol per deciliter of blood. Throughout the United States, the legal BAC limit is 0.08. The students were equally divided between men and women and differed in weight and usual drinking habits. Because of this variation, many students do not believe that the number of ingested drinks predicts BAC well.The data in the given figure consists of: a.2 unpaired sets of values, each of which has 16 values b.32 ordered pairs of values c.16 ordered pairs of valuesarrow_forward
- One study investigated whether the thickness of the banana peel is related to the banana variety and the fertilizer used. The research examined 4 different banana varieties and 3 different fertilizers.The following values were calculated from the data:SSr = 3.4 SSc =1.3 SSe =1.2The research first set out to find out if there is a difference in the average thickness of the banana peel between the fertilizers used. The used fertilizers are presented in the material with columns.Calculate the p-value of the test. Give the answer to two decimal places. Remember the correct decimal separator.arrow_forwardA researcher evaluates a new cholesterol medication by measuring cholesterol levels for a group of patients before they begin taking the medication and after they have been taking the medication for 8 weeks. A second researcher measures quality of life for a group of 40-year-old men who have been married for at least 5 years and a group of 40-year-old men who are still single. Explain why the first researcher is probably not concerned about the validity of the measurement, whereas the second researcher probably is. (Hint: What variable is each researcher measuring and how will it be measured?)arrow_forwardA research study examined the cholesterol levels in two groups (control vs. salmon consumption group) to see whether consuming more salmon in the diet would make a difference on cholesterol levels. The mean cholesterol level of the 60 people in the control group was 240 with a SD of 20. The mean cholesterol level of the 60 people in the salmon consumption group was 210 with a SD of 21. Calculate the z or t test statisticarrow_forward
- A group of students need to submit a project and they need to survey people about their daily routine. How many people should they survey in order to be 95% confident that the estimated ( sample) proportion is within three percentage points of the true population? Assume that pq= 0.25arrow_forwardUse the figure to the right, which shows the percentages of adults from several countries who favor building new nuclear power plants in their country. The survey incduded random samples of 1100 adults from Country A, 1012 adults from Country B, 1024 adults from Country C, and 1078 adults from Country D. At a=0.09, can you reject the claim that the proportion of adults in Country C who favor building new nuclear power plants in their country is greater than the proportion of adults from Country D who favor building new nuclear 80- power plants in their country? Assume the random samples are independent. 100- 60 40 20- I Country A 49% I Country B 48% O Country C 45% O Country D 41% Identify the claim and state H, and H. The claim is "the proportion of adults Country C who favor building new nuclear power plants in their country is greater than the proportion of adults from Country D who favor building new nuclear power plants in their country." Let p, represent the population proportion…arrow_forward
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