Help with making a Frequency Table Please

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chianti72116

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Aug 24, 2009
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Hi I am in psychology/statistics and I need help with making a frequency table. So far I have listed all the numbers that were given to me and their respective frequencies, but I am not sure how to calculate the percentages? If you know how to do this please show/explain how to do this. Thanks so much. :D

Here are the instructions from my assignment: The Following are the speeds of 40 cars clocked by radar on a particular road in a
35-mph zone on a particular afternoon:
30 36 42 36 30 52 36 33 30 32 35 32 33 40 37 34 36 31 35 20 24 46 23 31 32 45 34 37 28 40 34 38 40 52 31 33 15 27 36 40.
(a) Make a frequency table
(b) Make a histogram
(c) Describe the general shape of the distribution


Frequency Table
Score Frequency Percent
52 2
46 1
45 1
42 1
40 4
38 1
37 2
36 5
35 2
34 3
33 3
32 3
31 3
30 3
28 1
27 1
24 1
23 1
20 1
15 1
 


Hi Chianti:

If the frequency is 1, then its percentage of the entire sampling (clocking? :D ) is 1 part out of 40.

The decimal form of 1/40 is 0.025, and that corresponds to 2.5% (so, for example, we could say that the 28mph-car accounted for 2.5% of all the cars clocked).

If the frequency is 2, then the percentage is 2 parts out of 40.

The decimal form of 2/40 is 0.05, and that corresponds to 5% (so, for example, we could say that the 35mph-cars accounted for 5% of all the cars clocked).

If the frequency is 3, then the percentage is 3 parts out of 40.

The decimal form of 3/40 is 0.075, and that corresponds to 7.5% (so, for example, we could say that the 30mph-cars accounted for 7.5% of all the cars clocked).

The percents in that column must add up to 100%.

Can you finish the table now?

Cheers,

~ Mark 8-)

PS: CLICK HERE for an elementary review of percents.

 
Hi Mark,

Thank you so much for explaining that concept so that I could easily understand it!! I was able to calculate the values for the percentages:
If you don't mind, can you please double check these--I think they are correct. :D
Also do you know about how to make histograms?? If so please tell me how to make one. Thanks for helping a struggling student!!

Frequency Table
Score Frequency Percent
52 2 5%
46 1 2.5%
45 1 2.5%
42 1 2.5%
40 4 10%
38 1 2.5%
37 2 5%
36 5 12.5%
35 2 5%
34 3 7.5%
33 3 7.5%
32 3 7.5%
31 3 7.5%
30 3 7.5%
28 1 2.5%
27 1 2.5%
24 1 2.5%
23 1 2.5%
20 1 2.5%
15 1 2.5%
 


Hi:

The percents look good, to me.

A histogram is a bar chart. For each speed, you draw a bar whose length corresponds to the associated frequency.

CLICK HERE, and type in some speeds in the "Labels" column and their associated frequencies in the "Values" column. Use the [Draw Graph] button to see a histogram.

Your histogram will look the same way. List the speeds along the bottom from left to right IN ORDER from smallest to largest.

If it's not self-explanatory, then try googling keywords: how to draw histograms.

Cheers 8-)

 
Hi,

I just wanted to say that 36 mph has a frequency of six not five. % is 15.



chianti72116 said:
Hi I am in psychology/statistics and I need help with making a frequency table. So far I have listed all the numbers that were given to me and their respective frequencies, but I am not sure how to calculate the percentages? If you know how to do this please show/explain how to do this. Thanks so much. :D

Here are the instructions from my assignment: The Following are the speeds of 40 cars clocked by radar on a particular road in a
35-mph zone on a particular afternoon:
30 36 42 36 30 52 36 33 30 32 35 32 33 40 37 34 36 31 35 20 24 46 23 31 32 45 34 37 28 40 34 38 40 52 31 33 15 27 36 40.
(a) Make a frequency table
(b) Make a histogram
(c) Describe the general shape of the distribution


Frequency Table
Score Frequency Percent
52 2
46 1
45 1
42 1
40 4
38 1
37 2
36 5
35 2
34 3
33 3
32 3
31 3
30 3
28 1
27 1
24 1
23 1
20 1
15 1
Click to expand...
 
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