Of the 1,000 people, 550 people used company s's smartphone and 460 people used company a's smartphone. Find a 95% confidence interval for the percentage of people using S company smartphones.
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A: Given : n = 30 Mexperimental = 88 Mcontrol = 72 Standard deviation = 8.65 Null hypothesis : H0 :…
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Q: A recent study revealed that the average weight of babies born in the United States is normally…
A: Answer Reject H0
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Q: A recent study revealed that the average weight of babies born in the United States is normally…
A: The samples size is 87.
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A: Given: x=350 n=1000 p^=xn=3501000=0.35
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A: Given information 33% of 2302 surveyed adults play baseball
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A: Given, In a survey of 2313 adults, 714 say they believe in UFOs. n=2313 x=714 Sample proportion:…
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A: Answer may vary, one of the possible answers is given below:It is given that the average age of the…
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A: p^ = 59% = 0.59Sample size = 24086% confidence level
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A: Given that Sample sizes n1=75 , n2=45 Favorable cases x1=12 , x2=9
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A: In a random sample of 600 adults, 270 described themselves as vegetarians.
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A: The survey is conducted based on 1,000 adults conducted on August 2-10, 2017 from CompareCards,…
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A: Let the population proportion of women who bought compact cars be P Given: Sample size n =…
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- When 410 randomly selected college students were surveyed, 155 said they own their car. Construct a 95% confidence interval for the proportion of college students who say they own their cars. Include a statement interpreting your answer.If a 90%, a 95% and a 99% confidence interval are foung for a population mean, describe how the 3 interval estimates are related to each other. Which of the 3 intervals is most likely to contain the population mean?In 2001, the Gallup poll found that 81% of American adults believed that therewas a conspiracy in the death of President Kennedy. In 2013, the Gallup pollasked 1,039 American adults if they believe there was a conspiracy in theassassination, and found that 634 believe there was a conspiracy ("Gallup newsservice," 2013). Do the data show that the proportion of Americans who believein this conspiracy has decreased? Test at the 1% level.
- A researcher is testing which animal performs better on the anxiety task that involves a stranger walking into the room. In one group they test dogs and another cats and see how long it takes the animal to approach the person “stranger”. Here is the data from 10 subjects that was recorded in seconds:Dogs: 120, 126, 140, 115, 112, 130, 125, 108, 128, 143Cats: 125, 140, 128, 133, 138, 129, 135, 129, 140, 125Which set of scores has a lower SEM? You should be able to do this just by looking at the raw scores, but of course you can do the math if it helps you answer the question.A recent study revealed that the average weight of babies born in the United States is normally distributed with a mean of 7.5 pounds. This number is lower than recent years and so researchers are interested in determining what factors are associated with lower birth weights. One researcher decides to look at the age of the mother to determine if younger mothers have babies that are significantly heavier or lighter than average. To study this the researcher collects data from 87 babies who were born to mothers between the ages of 16 and 18. Only one baby was measured per mother. Twins and other multiple births were excluded. The average weight for these babies was 7.3 pounds with a standard deviation of .6 pounds Select the two-tailed null hypothesis for this statistical analysis. The babies of young mothers will not be significantly different than the weight of babies in the general population. The babies of young mothers will be significantly lighter than the…The drug manufacturer claim that taking gemfibrozil is beneficial to reduce the chance of heart attacks. 2051 men took the medication, and a control group of 2030 men took a placebo. During the next five years, 56 men in the drug group and 84 men in the placebo group had heart attacks. We would like to compare the proportion of men who develop heart attacks between the drug group and the placebo group. What are the correct x1 and x2 values in order to calculate the pooled sample proportion? a) x1=2051, x2=2030 b) x1=2051, x2=84 c) x1=56, x2=2030 O d) x1=56, x2=84
- In a survey of 2291 adults, 708 say they believe in UFOs. Construct a 90% confidence interval for the population proportion of adults who believe in UFOsDr. Watts is a pediatrician. His group did some research on the sleep habits of children less than 24 months old. They found a weak negative correlation between a child’s age and the number of hours per day he or she slept. What does this mean? As a child’s age increases, the hours of sleep decreases in a nearly perfect pattern. As a child’s age increases, the hours of sleep increases in a nearly perfect pattern. As a child’s age increases, the hours of sleep decreases but the relationship is not perfect. As a child’s age increases, the hours of sleep increases but the relationship is not perfect.Michelle, a student studying music, randomly sampled fellow music majors and asked whether they listen to music while they study. The resulting confidence interval for the proportion of music students who listen to music while studying is (0.09, 0.26). What is the margin of error?
- Alan wants to estimate the proportion of adults who walk to work. In a survey of 10 adults, he finds 1 who walk to work. Obtain and interpret a 95% confidence interval for the proportion of adults who walk to work.In 2008, there were 507 children in Arizona out of 32,601 who were diagnosed with Autism Spectrum Disorder (ASD) ("Autism and developmental," 2008). Find the proportion of ASD in Arizona with a confidence level of 99%. Show the work.According to Inc.com, 71% of job seekers used social media in their job search in 2018. Many believe this number is inflated by the proportion of 22- to 30-year-old job seekers who use social media in their job search. A survey of 22- to 30 -year-old job seekers showed that 310 of the 370 respondents use social media in their job search. In addition, 275 of the 370 respondents indicated they have electronically submitted a resume to an employer.