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Can you can tell the difference between coke and pepsi in a blind taste test? Most people say they can and have a preference for one brand or another. However, research suggests the people can correctly identify a sample of one of these products only 60% of the time. Suppose we investigate this question and select a sample of 15 college students.
a. How many of the 15 students would you expect to correctly identify Coke or Pepsi?
b. What is the probability that exactly 10 students surveyed will correctly identify coke or Pepsi
c. What is the probability at least 10 of the students will correctly identify Coke or Pepsi?
What is the probability that the mean life-span of a sample of 64 randomly selected bulbs will exceed 727 hours?
Find the P value for the indicated hypothesis test with the given standardized test statistic, z. Decide whether to reject H0 for the given level of significance deviation. Two-tailed test with test statistic z= -2.43 and standard deviation = 0.04..
Use the .05 significance level and the 5 step hypothesis testing process to check if there is a difference in the mean flight times among the three airlines.
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
Which of the variables below do you think will be roughly normally distributed? Please select all that apply.
A sample of 30 students are tested (sample mean=58, standard error=3.2). Compute a 99 percent confidence interval based on this sample's data. How do these students compare to the national sample?
What is the probability that the person thinks that "Made in America" ads boost sales and uses social media online?
In the spring of 2002, residents of the United States were quite worried about the possibility of further terrorists attacks. To gauge the public's sentiment on this topic, the Gallup Poll asked 1002 U.S.
Election poll reported that applicant had n approval rating 31% with margin of error E of 4%. Create a confidence interval for proportion of adults who approved of applicant.
Model Fitness. With any statistical model, we assess the fit: Does the model accurately depict the truth? Explain how one of the following helps assess the "fitness" of the mean.
Suppose you roll a standard die 2000 times and let X be the sum of the values you get. Using the Central Limit Theorem, for what value of a is P[X >= a] approximately equal to P[N(0,1) >= 2] ?
Compute the mean, median and mode measures of central tendency for the number of years of work experience. Which measure does the best job of describing central tendency for this variable?
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