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WorksheetsStatistics Summary Review IB Math A and I
Total questions: 50
Worksheet time: 1hrs 3mins
Determine the number of significant digits of 4.7500
3
4
5
6
Determine the number of significant digits of 0.0080500
2
3
8
5
To find the ______ , see which number you have the most of. It might help to put them in order or make a bar graph/histogram.
Mean
Median
Mode
Range
What is 3/7 chicken, 2/3 cat, and 2/4 goat?
Pig
Chicago
Cow
Bacon
Find the range.
5, 15, 10, 20, 15, 10, 15
5-20
10
15
13
State whether the data are discrete or continuous.
discrete
continuous
What is the expected value of a female who likes Pepsi?
10.5
11
14.5
6.3
What is the
χ2 calculated value for the following situation.
6.65
6.66
0.00991
1
If the χ2 critical value = 5.99 and the
χ2 calculated value = 7.35, what is the conclusion
Reject Ho, accept H1
Accept Ho, reject H1
there is not enough info to decide
The conclusion can only be made if we also know the p-value
What is the null hypothesis?
Injury type is independent of position played
Injury type is dependent on the position played independent
Injury type is correlated to position played.
If we are testing at a 5% significance level and our p-value is 0.00453, what is the conclusion?
Accept Ho
Reject Ho
We need to know chi-squared
You cannot do this problem without a calculator
Find the chi-squared calculated value for the table.
0.486170447
1.442392006
1.45
2
Given that the chi-squared calculated value is 12.5 and chi-squared critical value is 9.49. What would be your decision?
Reject the null
Fail to reject the null
If you have 2 values tied for the 6th and the 7th place when Calculating Spearman's ranked coefficient, then what rank do you put for both of them?
rs6
7
6.5
It depends on the actual values for the 6th and 7th ranked data pieces.
Calculate the PMCC between age and reaction time (3 significant figures).
(a)
Calculate Spearman's rank correlation coefficient between age and reaction time (3 significant figures).
(a)
Calculate Spearman's rank correlation coefficient between age and number of hours watching a TV a week (3 significant figures).
(a)
When testing with α=0.01 you get p=0.12 . Your decision should be
Reject H0 , there is a significant difference
Accept H0 , there is NOT a significant difference
Reject H0 , there is NOT a significant difference
Accept H0 , there is a significant difference
When testing with α=0.05 you get p=0.0459 . Your decision should be
Reject H0
Accept H0
A researcher claims the 2 groups below have different means. Test the 2 samples at a 5% level. (hint: t-test)
Sample 1: 5, 6, 7, 4, 3, 8
Sample 2: 4, 5, 7, 9, 10, 3, 8
What are the sample means?
Sample1: 5.5 Sample2: 10.6
Sample1: 5.5 Sample 2: 6.57
Sample 1: 10.6 Sample 2: 6.57
Sample 1: -.853 Sample 2: 10.6
A researcher claims the 2 groups below have different means. Test the 2 samples at a 5% level.
Sample 1: 5, 6, 7, 4, 3, 8
Sample 2: 4, 5, 7, 9, 10, 3, 8
Find the p-value. Use 3 sig figs
(a)
List 1 represents student test scores in a class where the teacher said, "Don't do the homework." List 2 is a class where the kids did their homework. Mr. Kirkton believes List 2 students did statistically better with a 10% significance level. List the alternative hypothesis (what you put in your calculator)
u1>u2
u1 = u2
u1<u2
List 1 represents student test scores in a class where the teacher said, "Don't do the homework." List 2 is a class where the kids did their homework. Mr. Kirkton now believes List 2 students did statistically better with a 5% significance level. What is your conclusion when you run the test?
reject the null
fail to reject the null
Estimate the correlation coefficient for this scatterplot.
A) r = 1.2
B) r = 0.89
C)r = 0
D) r = -0.89
Estimate the correlation coefficient for this scatterplot.
A) r = -0.9
B) r = 1
C) r = 0.9
D) r = -1
Describe the relationship between the variables.
A) Weak positive correlation
B) Weak negative correlation
C) Strong positive correlation
D) Strong negative correlation
As x increases, y increases. (hint: make a graph)
A) correlation coefficient
B) causation
C) positive correlation
D) negative correlation
The linear regression equation is y = 61.93x - 1.79. Use the equation to predict how far this person will travel after 10 hours of driving.
10 miles
618 miles
0.19 miles
620 miles
How many balls are there ?
20
24
16
9
Describe the distribution:
Positive skew
Negative skew
Symmetrical
Totally skewed
Interpret the y-intercept
Cars are worth $0 when they are 10 years old
New cars have a price of $22,500
It is impossible to find a new car for less than $30,000
When a car is 4 years old, it is worth about $15,000
What is the interquartile range?
4
2
8
62
Four friends have all been saving money. Brad has more than Adam but not as much as George. Jenny has more than George. List in order of who has the least to the greatest.
Use your calculator to find
σx for the list: 5, 6, 7, 10, 11, 12 (hint: 1 var stats)2.63
2.88
3.5
51
True or False: When conducting the student's t-test, the lists have to be the same length.
True
False
Not enough information
Synergy
Predicting the $ amount for a temperature of 35 degrees Celsius would be an example of __________
Using your line for the greater good of the business
Extrapolation
Interpolation
Discumbobulation
Your calculator says 1.35E-5. What does this mean?
135000
0.00135
0.0000135
1.35
Which of the following describes your IA? (Be honest--it won't hurt your score)
Pretty solid--won't need much after break
Decent--I have some work to do
Lacking--lots of stuff to get done that I didn't have finished
IA? What is that? Were we supposed to turn in an IA?
Which of the following would you like more explanation about? (Be honest--it won't hurt your score)
Chi-squared
Correlation/r/linear regression
Spearman's rank
Student's t-test
Do you have a graphing calculator for the IB exam (not Wabbit)? Be honest.
Yes
No
