A baker suspects there are too few chocolate chips in a 150g packet. He buys and weighs a random selection of 35 packets. The 95% confidence interval for the true mean weight is 153.7 ± 2.3g Which of the following is correct? A: 150 lies outside the confidence interval so his suspicion is supported. B: The data supports his suspicion. C: The sample mean, of 153.7g, is greater than 150g so all packets contain more chocolate chips. D: The data contradicts his suspicion.
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A baker suspects there are too few chocolate chips in a 150g packet. He buys and weighs a random selection of 35 packets. The 95% confidence interval for the true mean weight is 153.7 ± 2.3g
Which of the following is correct?
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- Solve the problem. Fifteen SmartCars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Which of the following would represent a 90% confidence interval for the average highway mileage of all SmartCars? O 47 ± 1.345- O 47 + 1.761- V15 O 47 + 1.645- 15 O 47 + 1.753-5 47 ± Nextdo fast ..with explanation both require..Here are summary statistics for randomly selected weights of newborn girls: n = 204, x = 28.4 hg, s =7.7 hg. Construct a confidence interval estimate of the mean. Use a 98% confidence level. Are these results very different from the confidence interval 26.6 hg < u < 31.2 hg with only 14 sample values, x = 28.9 hg, and s = 3.3 hg? What is the confidence interval for the population mean u? hgHere are summary statistics for randomly selected weights of newborn girls: n = 194, x = 32.9 hg, s = 6.5 hg. Construct a confidence interval estimate of the mean. Use a 90% confidence level. Are these results very different from the confidence interval 32.4 hgHere are summary statistics for randomly selected weights of newborn girls: n= 227, x= 32.7 hg. s=7.4 hg. Construct a confidence interval estimate of the mean. Use a 90% confidence level. Are these results very different from the confidence interval 31.8 hgA sample of 100 shoppers chosen at random from all shoppers in a given province indicated that 55% of them preferred a particular store (Shoprite).i. Find a 95% confidence interval for the proportion of all the shoppers that preferred Shoprite.ii. How large a sample of shoppers should we take in order to be 95% confident that the shoppers will buy from Shoprite?Assume that the heights of adult males (in inches) in the Sultanate of Oman are normally distributed on average. The mean length of a random sample of 25 adult Omani males is 69.72 inches, and the standard deviation is 4.15. My 90% confidence interval is:Here are summary statistics for randomly selected weights of newborn girls: n= 240, x= 31.8 hg, s=7.9 hg. Construct a confidence interval estimate of the mean. Use a 99% confidence level. Are these results very different from the confidence interval 29.1 hg < u< 34.7 hg with only 15 sample values, x= 31.9 hg, and s = 3.6 hg? What is the confidence interval for the population mean u? |hg < u< hg (Round to one decimal place as needed.)An individual in the market for a new cell phone was interested in the proportion of the U.S. population that uses an iPhone. A random sample of 1,234 was obtained and an approximate 95% confidence interval for this situation was calculated to be (0.42, 0.48). Which of the following statements is the best interpretation of this confidence interval? O a. We are 90% confident that the interval (0.42, 0.48) captures the sample proportion of U.S. residents who use an iPhone. O b. There is a between a 42% and 48% chance that a randomly selected U.S. resident uses an iPhone. OC, 95% of the U.S. residents who use an iPhone falls in the interval (0.42, 0.48). Od. We are 95% confident that the interval (0.42, 0.48) captures the population proportion of U.S. residents who use an iPhone.Find the following. Enter your answer rounded to at least two decimals. z a/2 for the 97% confidence intervalAssume that the 95% confidence interval for mean=9 and standard devaition=20. For a particular data, the standardized value z = 2.73. We can say that: Select one: a. The data with standardized value 2.73 does not belong to the confidence interval and the value is less than the average. b. The data with standardized value 2.73 does not belong to the confidence interval and the value is greater than the average. c. Cannot interpret the z-value information provided. d. The data with standardized value 2.73 if it belongs to the confidence interval and the value is less than the average. e. The data with standardized value 2.73 if it belongs to the confidence interval and the value is greater than the average.Here are summary statistics for randomly selected weights of newborn girls: n=191, x=28.9 hg, s =7.8hg. Construct a confidence interval estimate of the mean. Use a 90% confidence level. Are these results very different from the confidence interval 27.1 hg<u<30.5 hg with only 13 sample values, x=28.8 hg, and s=3.5 hg? What is the confidence interval for the population mean u? Are the results between the two confidence intervals very different?SEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons Inc
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