Question

HELP PLEASEEEE
(algebra 2)

Answer 1

You test 8 automobiles and find that their mileage ratings are 25, 25, 26, 27, 30, 31, 32, and 340 mpg, arranged in order from smallest to largest. The average of these numbers is 536 ÷ 8, or 67 mpg. However, the last data value (340 mpg) seems impossibly large, and you decide that it must be due to an error in the data gathering process. Rather than doing all your measurements all over again, at considerable expense, you decide to simply ignore the "bad" value of 340 mpg. (When they do this, scientists say they are "rejecting the outliers," by ignoring unreasonable values that are nowhere close to the main cluster of data points. This procedure has some risks.) What is the mean of the remaining mileage numbers?

HUH???

Answer 2

lmao.. alot of sentences just to confuse..

just ignore the 340.. and find the mean of the rest

mean = sum of all/ no. of samplees

Answer 3

why ignore 340?

Answer 4

because it is said in the question.

Answer 5

and do i add numbers that are there more than once? like 25 and 25?

Answer 6

if you include 340, the mean is 67, which is clearly much larger than 30, 31, 32,

but if you drop 340, then finding the mean of 30, 31, 32 will give you a number that's much closer to 30, 31, 32

Answer 7

sorry I meant to say "25, 25, 26, 27, 30, 31, 32" instead of just "30, 31, 32"

Answer 8

yeah you have to add them twice

Answer 9

so the answer is 28??

Answer 10

that is correct

Answer 11

yeah

Answer 12

A production manager tests 10 toothbrushes and finds that their mean lifetime is 450 hours. She then designs a sales package for this type of bulb stating that consumers can expect it to last approximately 460 hours. This is an example of what phase of inferential statistics?

Answer 13

A. Data gathering
B. Data analysis
C. Probability-based inference
D. Data organization

Answer 14

???

Answer 15

i guess C but not sure.

Answer 16

thanks, anyone else that is sure?

Answer 17

yes I agree

inference is making assumptions or educated guesses based on the gathered and analyzed data, so she's guessing that the toothbrushes will last 460 hours

Answer 18

thanks! you guys are soo smart

Answer 19

Which of the following activities are examples of data organization and analysis?

Check all that apply.

A. Running a weather station
B. Rejecting extreme data
C. Transferring the weather data to a computer application
D. Summing the number of days with precipitation, summing the number of sunny days, and summing the number of cloudy days without precipitation
E. Drawing a pie chart to show the percentage of sunny days, rainy days, and cloudy days without precipitation

Answer 20

C, D, E?

Answer 21

i think E..

Answer 22

just E?
it could be more than one

Answer 23

in C, you're just doing organization and not much analysis

Answer 24

oh.. it was D and E

Answer 25

lol if u think we are smart you should be writing testimonials for both of us later on :P :P

Answer 26

lol well then D and E,, ddn't knew can pick more thn one option

Answer 27

huh?

Answer 28

Shortly before the 1932 presidential election, a national magazine conducted a telephone survey of voters. Based on the results of the survey, the magazine predicted that Herbert Hoover (Republican) would beat Franklin Roosevelt (Democrat) by a landslide. In fact, exactly the opposite happened. The trouble with the survey was that in those Depression days, only rich people could afford phones, and they were likely to vote Republican. This is a classic example of an error in which phase of inferential statistics?

Answer 29

sorry i keep asking more.. but seems like you guys really know this stuff.. and im home schooled and am really lost with this.. thats why i came on here. and i have a lott of quizzes and a test to do still by tomorrow..

Answer 30

any options with this one??

Answer 31

oh ya! sorry

Answer 32

A. Data organization
B. Data analysis
C. Data gathering
D. Probability-based inference

Answer 33

hint: it has to do with drawing up the samples

Answer 34

D?

Answer 35

that's one of the last steps, making decisions based on what you drew up

Answer 36

but what they want is one of the first steps

Answer 37

ohh A?

Answer 38

that's also towards the end too, so that's out

Answer 39

or C

Answer 40

you start by gathering your data first

Answer 41

you need data to organize it and make analysis and inference off it

Answer 42

got it!! so:

When the production manager finds the average life of her toothbrush-lifetime data, this is an example of what phase of inferential statistics?
A. Probability-based inference
B. Data organization
C. Data analysis
D. Data gathering

A or C?

Answer 43

A is making a guess based off what you find in C

Answer 44

ohh D?

Answer 45

step 1) design a study

step 2) gather the data

step 3) analyze the data

step 4) organize the results and make them presentable

step 5) make guesses or inferences based on the results

Answer 46

that's your basic outline for any statistical study

Answer 47

so D?

Answer 48

no it's not gathering

Answer 49

you analyze the data after you gather it

Answer 50

huh??
i dont get what its asking..

Answer 51

when you have a bunch of numbers and you average them, what are you doing to that data? gathering it? or analyzing it?

Answer 52

analyzing

Answer 53

correct

Answer 54

so you're at the data analysis stage

Answer 55

ohh so C

Answer 56

yes

Answer 57

You test 8 automobiles of the same make and model and find their mileage ratings to be 25, 25, 26, 27, 30, 31, 32, and 1,000,000 mpg, arranged in order from smallest to largest. If you use inferential statistics (and reject the outlier) to predict what mileage consumers can expect when they buy this type of car, what value will you predict?

A. 125,024.5 mpg
B. 28 mpg
C. 67 mpg
D. 24.5 mpg
E. 30 mpg

looking for what? mean, mode, median...?

Answer 58

sounds like you want the mean

Answer 59

of 25, 25, 26, 27, 30, 31, and 32?

Answer 60

yes

Answer 61

the outlier really really skews the mean, so ignore it completely since it's just one value and it doesn't represent the majority

Answer 62

When the production manager arranges her data on product lifetimes from the smallest to the largest number, this is an example of what phase of inferential statistics?

A. Data gathering
B. Data collection
C. Data organization and analysis
D. Probability-based inference

C?

Answer 63

yeah I think so, you're organizing or arranging the data

Answer 64

thankss

Answer 65

np

Answer 66

???????

Answer 67

basically the first bar represents how many numbers start with 3

so numbers like 342, 375, etc

Answer 68

the next bar represents numbers that start with 4 (like 412, 423, etc)

and so on

Answer 69

/D

Answer 70

??

Answer 71

good

Answer 72

choices in next pic

Answer 73

*check more than one*

Answer 74

???????????

Answer 75

any ideas?

Answer 76

D. a or b

Answer 77

or all 4.? A,B,C,D

Answer 78

E is definitely false

Answer 79

but are you sure about B? look again

Answer 80

oh. read it wrong. exhausted and overwhelmed! :(

Answer 81

so A, C, D?

Answer 82

nvm got that one! i have more tho

Answer 83

ok just one more

Answer 84

can be more than one!

Answer 85

????????

Answer 86

hello?

Answer 87

hint: the area under the curve represents probability

you can't have a negative probability

Answer 88

areas above the x axis represent positive areas

areas below the x axis represent negative areas

Answer 89

huhh

Answer 90

soo.....????

Answer 91

for instance, this function has a positive area



but this function has a negative area