Statistics: Arithmetic Mean and Relative Frequency
HONORS STATISTICS
CH1
In an observational study, researchers simply observe characteristics and take measurements, as in a sample survey.
In a designed experiment, researchers impose treatments and controls and then observe characteristics and take measurements.
Data from a sample of citizens of a certain country yielded the following estimates of average TV viewing time per month for all the citizens.
Answer: Inferential, because the statistics are used to make inference about the population.
* 50 kids are divided into 2 groups. One is exposed to a vid on bullying. The other isn’t. After one week, both groups are questioned about their attitudes about violence. This is a designed experiment
5 state officials: Governor (G) , Secretary of State (S), Attorney (A), Representative ®, Press (P) a) list 10 possible samples w/out replacement of size 2 b) if a simple random sampling procedure is used to obtain a sample of two officials, what are the chances it’s the first sample?
GS, GA, GR, GP, SA, SR, SP, AR, AP, RP
1/10
CH 2
1. According to a technology company, 5 countries cost in a certain area. Identify type of data: Rank | Country | Cost | 1 | Country a | $54 | 2 | Country b | $332 | 3 | Country c | $99 | 4 | Country d | $98 | 5 | Country e | $221 |
Answer: Rank: Quantitative, Discrete Country: Qualitative Cost: Quantitative, Continuous
2. original data is data about order or rank given on a scale such as 1, 2, 3.. or A, B, C,… does the following variable yield ordinal data? Hair color
No, because the data isn’t ordered in some way
3. For a study, a student bought 3 bags of colored candy from stores and counted each color. The average number of each color in the three bags was distributed as shown. Color | Frequency | Brown | 556 | Yellow | 118 | Red | 344 | Orange | 57 | Green | 87 | Blue | 34 |
a) obtain a relative – frequency distribution College
CH1
In an observational study, researchers simply observe characteristics and take measurements, as in a sample survey.
In a designed experiment, researchers impose treatments and controls and then observe characteristics and take measurements.
Data from a sample of citizens of a certain country yielded the following estimates of average TV viewing time per month for all the citizens.
Answer: Inferential, because the statistics are used to make inference about the population.
* 50 kids are divided into 2 groups. One is exposed to a vid on bullying. The other isn’t. After one week, both groups are questioned about their attitudes about violence. This is a designed experiment
5 state officials: Governor (G) , Secretary of State (S), Attorney (A), Representative ®, Press (P) a) list 10 possible samples w/out replacement of size 2 b) if a simple random sampling procedure is used to obtain a sample of two officials, what are the chances it’s the first sample?
GS, GA, GR, GP, SA, SR, SP, AR, AP, RP
1/10
CH 2
1. According to a technology company, 5 countries cost in a certain area. Identify type of data: Rank | Country | Cost | 1 | Country a | $54 | 2 | Country b | $332 | 3 | Country c | $99 | 4 | Country d | $98 | 5 | Country e | $221 |
Answer: Rank: Quantitative, Discrete Country: Qualitative Cost: Quantitative, Continuous
2. original data is data about order or rank given on a scale such as 1, 2, 3.. or A, B, C,… does the following variable yield ordinal data? Hair color
No, because the data isn’t ordered in some way
3. For a study, a student bought 3 bags of colored candy from stores and counted each color. The average number of each color in the three bags was distributed as shown. Color | Frequency | Brown | 556 | Yellow | 118 | Red | 344 | Orange | 57 | Green | 87 | Blue | 34 |
a) obtain a relative – frequency distribution College