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anonymous
 one year ago
**MEDAL/FAN
A study of five hundred adults found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 14 hours. The population standard deviation is 3 hours. What is the margin of error for a 95% confidence interval?
0.134
0.220
0.263
0.313
anonymous
 one year ago
**MEDAL/FAN A study of five hundred adults found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 14 hours. The population standard deviation is 3 hours. What is the margin of error for a 95% confidence interval? 0.134 0.220 0.263 0.313

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@ganeshie8 @pooja195 @Michele_Laino

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1please wait, I'm pondering...

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1a 95% confidence interval, means an error of: \[\Large \frac{{1.96\sigma }}{{\sqrt {500} }} = \frac{{1.96 \times 3}}{{\sqrt {500} }} = ...?\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1I got that number: 1.96, using my tables of the "erf" function

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1N=500 is the size of your sample

anonymous
 one year ago
Best ResponseYou've already chosen the best response.05.88  22.36067977

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Can u help me with this? A coach wants to know if football players who warm up before a game will score more points than those who don't warm up. He will break the team up into two groups and make sure each player gets equal time on the field. He will then count how many points each player makes during the game. What statistic should he study? The mean number of points earned by each player The mean number of points earned by each group The standard deviation of the number of points earned by each player The standard deviation of the number of points earned by each group

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1I think the last option

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1since the coach is searching for an average value for player

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Can you help me with one last question? Crunchy Potato Chip Company has two different manufacturing plants. Company officials want to test whether each plant fills the bags with the same number of ounces. A random sample of potato chip bags from plant A had a mean of 24.2 ounces in each bag. A random sample from plant B had a mean of 22.2 ounces. They randomized the data over 100 trials and the difference of means for each trial is shown in the dot plot below. What can Crunchy Potato Chip Company conclude from this study?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Options: The difference is not significant because a difference of 2.0 is very likely. The difference is not significant because a difference of 2.0 is not very likely. The difference is significant because a difference of 2.0 is not very likely. The difference is significant because a difference of 2.0 is very likely.

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1I'm pondering...

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1I think the second option, since we have no outcomes whose difference is 2 ounces

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1I confirm my answer

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1If your problem is searching for a difference 2, in absolute value, then we have to consider also the result 2.0

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1in that case the right option is option A, since outcomes for a difference about 2.0 give a low probability

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh okay! Thank you very much :)
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