21. Why can't you just use the sample mean to estimate the population mean without including a...
Question:
21.
Why can't you just use the sample mean to estimate the population mean without including a margin of error?
Group of answer choices
The sample mean is a random quantity and so you must account for random variation.
not enough information to decide
No answer text provided.
The margin of error measures mistakes made by the statistician
22. DISCUSSION - Bomb on a plane
Disturbed by the rise in terrorism, a statistician decides that whenever he travels by plane, he will bring a bomb with him. His reasoning is that although it is unlikely that there will be a terrorist with a bomb on his plane, it is very, very unlikely that two people will bring bombs on a plane. Explain why this is or isn’t true.
Group of answer choices
The events are independent: The statistician bringing a bomb on the plane has no effect on the terrorist bringing a bomb on the plane.
No answer text provided.
Not enough information to decide
This is an effective way to combat terrorism.
23. DISCUSSION - The Lucky Chances Lottery
In the “Lucky Chances” lottery a box has 100 balls. 60 balls are marked “Good.” 40 balls are marked, “Bad.” To play this lottery, you draw a ball at random and look at the message. You play this lottery every day. What happens over the course of 500 plays?
Group of answer choices
About 60% of the selected balls will be marked good and about 40% will be marked bad
Impossible to tell
Depends on whether you're lucky or unlucky.
No answer text provided.
24. DISCUSSION - Mini-market with winning lottery tickets
There is a mini-market in Ohio that has sold 3 winning lottery tickets in the past year. Explain why this happens
Group of answer choices
Not enough information to decide
Cheating
This is impossible
Lots of tickets sold at this location, along with there being so many ticket-selling locations that a few will have more than one winner just due to chance
25. DISCUSSION - Online polls
A public opinion poll posted on Facebook will estimate the percentage of people who don’t like taking opinion polls. Is this a good way to administer such a poll? Explain.
Group of answer choices
No because this is a "self-selected" poll and people who don't like taking online polls won't take this poll
Yes, online polls reach lots of people
costs too much to run an online poll
Everyone looks at Facebook, so yes, it's a good place to have a poll.
Statistics Unlocking the Power of Data
ISBN: 978-1118583104
1st edition
Authors: Robin H. Lock, Patti Frazer Lock, Kari Lock Morgan, Eric F. Lock, Dennis F. Lock