Suppose taxi fares from Logan Airport to downtown Boston is known to be normally distributed and a sample of seven taxi fares produces a mean fare of $22.31 and a 95% confidence interval of [$20.5051, $24.2091]. Which of the following statements is a valid explanation of the confidence interval. A) 95% of all taxi fares are between $20.51 and $24.21. B) We are 95% confident that a randomly selected taxi fare will be between $20.51 and $24.21. C) The mean amount of a taxi fare is $22.31, 95% of the time. D) We are 95% confident that the average taxi fare between Logan Airport and downtown Boston will fall between $20.51 and $24.21.

A genetic experiment with peas resulted in one sample of offspring that consisted of 425 green peas in a 162 yellow peas.  a. Construct a 95% confidence interval to estimate of the percentage of yellow peas. b. it was expected at 25% of the offspring peas would be yellow. Given the percentage of offspring yellow peas is not 25%, do the results contradict expectations?

A 95% confidence interval for how much time on average GRC students spend doing homework every day is 75 to 105 minutes.Choose a correct interpretation of the statement above. A. If random sampling is repeated, 95% of the confidence intervals created will capture the true mean. B. If random sampling is repeated, 95% of the samples will have a mean that is between 75 and 105 minutes. C. 95% of GRC students study between 75 and 105 minutes on average every day. D. There is 95% chance that the true mean is between 75 and 105 minutes.

A researcher is interested in estimating the average amount of sleep obtained by first-year students at MacEwan University. The researcher obtains a random sample of 100 first-year students from MacEwan from which she obtains an average of 7.1 hours of sleep. a. Suppose the researcher obtains a 95% confidence interval of (6.9, 3). What is the margin of error? b. It is recommended that young adults sleep at least 7.5 hours per night. Does the interval from (a) provide evidence that, on average, first-year students at MacEwan are under sleeping? Explain c. Is it necessary for the population of interest to be normally distributed for the interval in (a) to be valid? Explain. d. Briefly explain why the interval estimate from (c) is superior to the point estimate.

A genetic experiment with peas resulted in one sample of offspring that consisted of 441 green peas and 165 yellow peas. a. Construct a 90​% confidence interval to estimate of the percentage of yellow peas. b. Based on the confidence​ interval, do the results of the experiment appear to contradict the expectation that​ 25% of the offspring peas would be​ yellow?

Credit card ownership varies across age groups. Suppose that the estimated percentage of people who own at least one credit card is 64% in the 18–24 age group, 84% in the 25–34 age group, 75% in the 35–49 age group, and 77% in the 50+ age group. Suppose these estimates are based on 465 randomly selected people from each age group. (a) Construct a 95% confidence interval for the proportion of people in the 18–24 age group who own at least one credit card. (Round your answers to four decimal places.) to Construct a 95% confidence interval for the proportion of people in the 25–34 age group who own at least one credit card. (Round your answers to four decimal places.) to Construct a 95% confidence interval for the proportion of people in the 35–49 age group who own at least one credit card. (Round your answers to four decimal places.) to Construct a 95% confidence interval for the proportion of people in the 50+ age group who own at least one credit card. (Round your answers to four…

A genetic experiment with peas resulted in one sample of offspring that consisted of 447 green peas and 169 yellow peas. a. Construct a 95​% confidence interval to estimate of the percentage of yellow peas. b. Based on the confidence​ interval, do the results of the experiment appear to contradict the expectation that​ 25% of the offspring peas would be​ yellow?

5.) A genetic experiment with peas resulted in one sample of offspring that consisted of 410 green peas and 151 yellow peas. a. Construct a 90​% confidence interval to estimate of the percentage of yellow peas. b. It was expected that​ 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not​ 25%, do the results contradict​ expectations?

A genetic experiment with peas resulted in one sample of offspring that consisted of 442 green peas and 156 yellow peas.  a. Construct a 95​% confidence interval to estimate of the percentage of yellow peas. b. It was expected that​ 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not​ 25%, do the results contradict​expectations?

A genetic experiment with peas resulted in one sample of offspring that consisted of 448 green peas and 171 yellow peas.   a. Construct a 95​% confidence interval to estimate of the percentage of yellow peas.   b. It was expected that​ 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not 25%, do the results contradict​ expectations?   Express the percentages in decimal form.