We poll 550 people and find that 40% favor Candidate S. In order to estimate with 95% confidence what percent of ALL voters would vote for Candidate S, we should use: TInterval 2-PropZInt 1-PropZInt 2-SampTInt 2-SampZInt ZInterval
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We poll 550 people and find that 40% favor Candidate S. In order to estimate with 95% confidence what percent of ALL voters would vote for Candidate S, we should use:
- TInterval
- 2-PropZInt
- 1-PropZInt
- 2-SampTInt
- 2-SampZInt
- ZInterval
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- A new restaurant with 134 seats is being planned. Studies show that 57% of the customers demand a smoke-free area. How many seats should be in the non-smoking area in order to be very sure (μ+3σ) of having enough seating there?A telecommunications company conducted a survey about cell phone companies to determine what proportion of the population preferred AT&T to Sprint. Of 1800 randomly and independently selected people that were surveyed, 1275 preferred AT&T to Sprint. How many success in the sample? How many failures in the sample? ? What size sample does the population have to exceed?A random sample of 800 Tennessee residents is taken. Of those 800 residents, 170 said their favorite college basketball team was UK. Give a point estimate for p, the population proportion of all Tennessee residents that have UK as their favorite college basketball team.
- Suppose a marketing company did do a survey. They randomly surveyed 200 households and found that in 120 of them, the woman made the majority of the purchasing decisions. We are interested in the population proportion of households where women make the majority of the purchasing decisions.Globally, 35% of all ridged brittleshell tortoises have spots on their shells. A herpetologist in Citition collects a sample of 38 ridged brittlesell tortoises and finds that 16 of them have spots on their shells. The herpetologist would like to test the claim that the proportion of ridged brittleshell tortoises in Cititon with spots on their shells is greater than 35%. The herpetologist ends up rejecting the null hypothesis. If the actual proportion of ridged brittleshell tortoises in Cititon with spots on their shells is 41%, then what type of error, if any, has occurred? In the problem above, what is the test statistic? A national forest service wanted to estimate the number of deer in a particular national park. They cotton tag 71 deer and release him back into the park. Later they selected a sample of 272 deer. Of the 272 dear, 17 were tagged, assuming that the portion of tag deer and the sample holds for all deer in the forest, what is the best estimate of the number of deer in the park? 
- a study is conducted to access the impact of caffeine consumption, smoking, alcohol consumption, and physical activity on cardiovascular disease. suppose that 40% of the participated consume caffeine and smoke. if 8 participate are evaluated, what isthe propability that exactly half of them consume caffeine and smoke?The television show CSI: Shoboygan has been successful for many years. That show recently had a share of 19, which means, that among the TV sets in use, 19% were tuned to CSI: Shoboygan. An advertiser wants to verify that 19% share value by conducting its own survey, and a pilot survey begins with 12 households have TV sets in use at the time of a CSI: Shoboygan broadcast.The recidivism rate for convicted sex offenders is 9%. A warden suspects that this percent is higher if the sex offender is also a drug addict. Of the 347 convicted sex offenders who were also drug addicts, 42 of them became repeat offenders. What can be concluded at the αα = 0.10 level of significance?
- In a random sample of 100 parts ordered from vendor A, 12 were defective. In a random sample of 200 parts ordered from vendor B, 10 were defective. Estimate the proportion of parts from vendor A that are defective and find the uncertainty in the estimate. Estimate the proportion of parts from vendor B that are defective and find the uncertainty in the estimate.Some people seem to believe that you can fix anything with duct tape. Even so, many were skeptical when researchers announced that duct tape may be a more effective and less painful alternative than liquid nitrogen, which doctors routinely use to freeze warts. An article described a study conducted at a medical center. Patients with warts were randomly assigned to either the duct tape treatment or the more traditional freezing treatment. Those in the duct tape group wore duct tape over the wart for 6 days, then removed the tape, soaked the area in water, and used an emery board to scrape the area. This process was repeated for a maximum of 2 months or until the wart was gone. Data consistent with values in the article are summarized in the following table. Treatment n Number with WartSuccessfully Removed Liquid nitrogen freezing 103 60 Duct Tape 101 88 Do these data suggest that freezing is less successful than duct tape in removing warts? Test the relevant hypotheses using…Some people seem to believe that you can fix anything with duct tape. Even so, many were skeptical when researchers announced that duct tape may be a more effective and less painful alternative than liquid nitrogen, which doctors routinely use to freeze warts. An article described a study conducted at a medical center. Patients with warts were randomly assigned to either the duct tape treatment or the more traditional freezing treatment.Those in the duct tape group wore duct tape over the wart for 6 days, then removed the tape, soaked the area in water, and used an emery board to scrape the area. This process was repeated for a maximum of 2 months or until the wart was gone. Data consistent with values in the article are summarized in the following table. Treatment n Number with WartSuccessfully Removed Liquid nitrogen freezing 100 60 Duct Tape 103 88 Do these data suggest that freezing is less successful than duct tape in removing warts? Test the relevant hypotheses using…