Cell Phones Have Become An Essential Part Of Our Everyday Lives We Use Them For Communication Photography Browsing A 1 (32.79 KiB) Viewed 21 times
Cell Phones Have Become An Essential Part Of Our Everyday Lives We Use Them For Communication Photography Browsing A 2 (37.45 KiB) Viewed 21 times
Cell phones have become an essential part of our everyday lives. We use them for communication, photography, browsing, and banking, among other things. Choosing the right cell phone is important, and is based on several factors, including weight. Suppose the weight of a cell phone is distributed normally with a known population standard deviation of 18 g. A random sample of 15 cell phones was conducted to calculate a sample mean weight of 155.7 g. Construct a 95% confidence interval for the population mean weight, mu. Choose the correct answer below based on constructing this interval (it may be a good idea to write your final interval down, as the next question may relate to this one). Hint: although the sample size is small, you may use the standard normal distribution, as the population standard deviation is known Hint: we cover this in the video "CI 20202"
a a) a. the interval is [146.59, 164.81]; the critical value used is 1.96 Ob b) b. the interval is [146.59, 164.81] ; the margin of error is (1.96 * 18 Oc) c. the interval is (146.59, 164.81]; the margin of error is (1.645 18 V15 O d) d. the interval is (137.70, 173.70]; the margin of error is (1.96 18 * V15 Oe) e. both a and b are correct e. f) f both b and d are correct
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