STATS: Exam 1 (Ch. 1-3)

If these are the prices of the your restaurant specials: $2.95, $1.49, $3.50, $2.95, $1.99. and $1.99, what is the average cost of a meal at your restaurant?

$2.48

The sum of deviations from the mean is always equal to:

0

What is the range for this set of scores: 4, 4, 4, 4, 4, 4, 4

0

What is the range for this set of scores? 7, 6, 7, 7, 6, 6, 7

1

What is the median for the following set of scores: 5, 8, 13, 19, 20, 15, 7, 13, 17, 18, 12, 15, 16, 20, 19, 11, 10, 17, 18, 19

15.5

What is the range for these scores: 56, 89, 77, 45, 61, 60, 82

44

What is the mode of this group: 3, 5, 6, 1, 2, 5, 4, 2, 5

5

What is the median of this set of scores: 14, 16, 2, 9, 5, 6, 8, 13, 10, 1, 11

9

Do you need to know what 'n' is to compute the mean for a set of scores?

yes, because it is used to divide the total to calculate the mean

What are the three types of research questions we can ask in statistics?

descriptive, relationship, comparative

If your SD = 2.135, what is your variance? What is your range?

Var = 4.558, range = (can't tell with what we're given)

When is Project #2 due?

at the end of Week #4

Why is the range the most convenient measure of variability? Why is it the most imprecise measure of variability?

because you only have to subtract the low number from the high number to calculate it; because it only takes in to account the highest and lowest numbers, not any of the rest of them

The mean, median and mode are three measures of:

central tendency

________ is a collection of measurements or observations.

data

Where is the "General Questions" discussion area (forum) for this class?

in the "discussion topics" folder

Where can you find information for our Project #1?

in the folder titled "Projects"

According to the 'Common Greek Symbols' document, what does 'μ' mean?

it's the average (The mean) of something

If a graph is narrow, with the scores piled up high around the mean, would this indicate more agreement or less agreement on something?

more agreement; it shows that more people got the same or similar answers

Can a weekly test be made up (taken a after the deadline)?

no, not if you miss the deadline

How many times are you allowed to take a weekly test?

only once

For a group of people (μ = 5 and SD = 1.50) on the pain scale. If you subtract the SD from the mean (and get a new number) and then add the SD to the mean (and get a new number), what does this tell you?

where most people scored on the pain scale

would a graph with a large standard deviation have a smaller or wider base

wider

You live in Seattle and have just taken a survey of your six best friends' income. Incidentally, one of your friends is the super-wealthy Bill Gates. Here is your data: $35,920, $41,476, $43,500, $47,031, $50,577, $164,352,000,000 Calculate the mean with and without Bill's income. Why might you want to remove Bill from your survey data?

with Bill's income in the data it makes it seem like the average income is much higher than it really is

Does the standard deviation get smaller as people score more similarly on a test?

yes, as people score more similarly, they are closer to the mean score and thus the deviation from the mean will be less on average

A _______ is a numerical value that describes a sample.

statistic

Without calculating the mean or median of the following data set, which will be larger? 3, 4, 5, 6, 6, 6, 7, 7, 32

the mean will be larger

For this set of scores, would you want to use the mean or the median? 3,454, 5,645, 4,565, 4,905

the mean, because nothing stands out as overly large or small

For this set of scores, would you want to use the mean or the median? 3,454, 9,645, 4,565, 4,905

the median, because there seem to be overly large or small outliers

Of the standard deviation and the variance, which one is in the same unit as the data?

the standard deviation

If SS = sum of squares, what is this the formula for? s = square root of (SS/n-1)

the standard deviation for the sample

What is this part of the standard deviation formula called? ε (sigma capital S) (x-x(with line over top)) ^2

the sum of squares

What is the mode of this group: vanilla, strawberry, mint chip, chocolate, butter pecan, strawberry, peach, vanilla, choc chip, toffee

there is no mode, it is bimodal

If you calculated the mean of a data set to be 28.375 and the median is 25.5, the mean is higher than the median. In general, when your mean is higher than your median, WHY is it higher than your median?

there were some high scores that influenced the mean, pulling it up a bit

I understand that if I cheat in ANY way, or use the aid of other material or people other than that which has been specifically stated in the course, that I may receive a zero for this test, with the possible risk of expulsion from the college.

yes, i understand

Would you expect less variability on a measure of height for college freshmen than you would on a measure of personality?

yes, they have the probably all reached a similar height, having stopped growing but would still show a wide range of personality types

Under what conditions would you use the median rather than the mean as a measure of central tendency?

you use the median when you have extreme scores that would disproportionately influence the mean

What is the mean and the standard deviation for these scores? 1, 4, 3, 6, 2, 7, 18, 3, 7, 2, 4, 3

µ = 5, SD = 4.533