Mathematics, 24.04.2021 22:10, meiaalvizo2005
A sociologist was curious about how much smartphone access has changed for American teenagers. They
obtained separate random samples of teenagers from 2017 and 2013. Here are their results:
Has access to smartphone?
2017
2013
Yes
450
120
No
150
280
Total
600
400
They want to use these results to construct a 95% confidence interval to estimate the difference in the
proportion of teens each year who had access to a smartphone (p2017 - P2013). Assume that all of the
conditions for inference have been met.
Which of the following is a correct 95% confidence interval based on their data?
Answers: 2
Mathematics, 21.06.2019 17:00, michaelbromley9759
How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21
Answers: 1
Mathematics, 21.06.2019 20:00, Oregonduckerz
The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest
Answers: 2
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