12. A health professional is concerned that people aren't brushing their teeth correctly in Knox County. During a recent event she talked to 118 people, and found that only 63 were brushing correctly. Answer the following: (a) Given this information, what type of confidence interval would be best to calculate u and why? (b) Find the margin of error for a 97% confidence interval. (c) Find the 95% confidence interval. (d) If she wanted to stay within a 4% margin of error, how many people would she need to survey?

Q: In a 2017 survey was conducted on what was the best day of the week.  The result indicated that 90%…

A: Margin of error is given by, And Confidence interval for this study,

Q: In a survey of 3084 adults aged 57 through 85 years it was found that 81.9% of them used at least…

A: Given : Sample Size, n = 3084 confidence level,c=0.9 Significance level, α…

Q: both companies used the same sample size, what does this imply about the margin of error for each…

A:

Q: The figure to the right shows the results of a survoy in which 1013 adults from Country A, 1001…

A: It was found that out of the 1013 adults from country A, 33% of the adults say national identity is…

Q: Suppose that the a college wants to have an idea of the average SAT score of the incoming freshman…

A: The confidence level is 0.90, the standard deviation is 310 and margin of error E is 50.

Q: Which of the following would result in the narrowest confidence interval? A. 80% confidence level…

A: The narrowest confidence interval will result from larger sample size and a smaller confidence…

Q: An apartment hunter is shopping for either a one-bedroom or two-bedroom apartment in different…

A: Here the new variable is  X= difference  = (Two bed- One bed)  Then mean = ΣXi/n X̄ = (200 + 290 +…

Q: A genetic experiment with peas resulted in one sample of offspring that consisted of 422 green peas…

A: (a) Obtain the 95% confidence interval to estimate of the percentage of yellow peas. The 95%…

Q: At a large university in Conway, South Carolina, the Dean wants to know what proportion of students…

A: We have given thatn = 200x = 145Confidence level (c) = 99% = 0.99Significance level (α) = 1 - c =  1…

Q: We are interested in comparing the percentage of females versus males who expect their future to be…

A: Summarising the given information below. The number of total surveyed females and males:…

Q: The US Treasury found that a random sample of 1309 $20 bills found that 837 of them had trace…

A:

Q: Angela is trying to figure out the sample size for the data set she wants to collect. She is…

A: The larger the sample size, the less will be the value of standard error. Therefore, the range of…

Q: A genetic experiment with peas resulted in one sample of offspring that consisted of 434 green peas…

A: Given Data Sample Size, n = 602 Number of successes, x = 168.0 Significance level,…

Q: According the the U.S. Census bureau, the percentage of Santa Ana residents living in poverty is…

A: From the provided information,

Q: When Mendel conducted his famous genetics experiments with peas, one sample of offspring consisted…

A: a. The sample proportion of yellow peas is, Thus, the sample proportion of yellow peas is 0.262.

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.