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which group do you think has the higher mean??
B so D?
uh, not quite, see how group B has more dots on the left side?
that means that group B is going to have a smaller mean, so our answer is..?
The following table shows the data collected from a random sample of 100 middle school students on the number of hours they do household chores every week: Weekly Duration of Household Chores Time (in hours) 0–1 2–3 4–5 6–7 Number of Students 32 64 3 1 There are 1,500 students in the school. Based on the sample proportion, how many students in the school would be expected to do household chores for at least two hours every week? 480 960 1,020 1,440
take a look at the table, how many students do at least 2 hours of chores per week?
not quite, think carefully... "at least 2" means anything more than 2
right and it says 2-3 hours is 64
there's more than that, though... look at the table again carefully...
4-5 amd 6-7
right, so we add them all up, giving us...?
that's not what I meant, I meant to add the number of students...
there we go! now, we have (68 students/100) for our sample, let's multiply this by 1500 students to get our answer (68/100)*(1500) = ?
The following table shows the data collected from four random samples of 50 students from a small middle school regarding the type of television shows they prefer to watch: Television Show Preferences Sample # News Music Movies Cartoons Total 1 2 12 6 30 50 2 3 10 5 32 50 3 5 13 7 25 50 4 6 19 8 17 50 Based on the results in the table, which type of television show is preferred by the majority of students in the samples? News Music Movies Cartoons
what do you think the answer is?
The price of some jewelry sets in a store are shown below: Store Price A $110,000 B $100,000 C $1,110,000 D $130,000 E $120,000 Based on the data, should the mean or the median be used to make an inference about the price of the jewelry sets in the store? Mean, because it is in the center of the data Median, because it is in the center of the data Median, because there is an outlier that affects the mean Mean, because there are no outliers that affect the mean
hint: is there an outlier?
pay attention to my hint: is there an outlier?
are you sure? there is one data point that is much larger than the others
oh wait.. there is an outlier
right, so our answer is...?
Four students did a survey to find the ice cream flavor sixth-grade students prefer. The table below shows the method each student used to conduct the survey: Student Method Jane Asked 100 sixth-grade students at random what their favorite ice cream flavor is Ken Asked 100 students at random from his seventh-grade class what their favorite ice cream flavor is Sasha Asked 100 eighth-grade students at random what their favorite ice cream flavor is Kevin Asked 100 third-grade students at random what their favorite ice cream flavor is Which student's survey is most likely not biased? Jane Ken Sasha Kevin
hint: the goal is to find data for 6th graders, so our answer is...?
Sue wants to know how many families in her small neighborhood of 50 homes would volunteer to help at a neighborhood animal shelter. She put all the addresses in a bag and drew a random sample of 25 addresses. She then asked those families if they would volunteer to help at the shelter. She found that 18% of the families would volunteer to help at the shelter. She claims that 18% of the neighborhood families would be expected to help at the animal shelter. Is this a valid inference? Yes, this is a valid inference because the 25 families speak for the whole neighborhood Yes, this is a valid inference because she took a random sample of the neighborhood No, this is not a valid inference because she only asked 25 families No, this is not a valid inference because she did not take a random sample of the neighborhood
this is a random sample, so...?
whichever one has the greater MAD has the greater variability
read the problem carefully...
I really need sleep, how many more are there?
5 quick ones :) and thats it .. i promise
The following table shows the data collected from 2 random samples of 100 students each from an after-school club regarding their favorite outdoor activity: Sample Canoeing Bike Racing Reading Total 1 40 35 25 100 2 45 40 15 100 Which of the following observations can be made about the number of students in the club who prefer canoeing? It is more than the number of students who prefer bike racing and reading combined. It is less than the number of students who prefer bike racing and reading combined. It is equal to the number of students who prefer reading. It is less than the number of students who prefer bike racing.
what do you think the answer is? just go through each choice and see which one is true
are you sure? is the number for canoing less than the number for bike racing?
so d is not the answer, keep trying
Noah wants to predict who will be selected as the sixth-grade treasurer for student council. Which of the following groups should Noah survey to make his prediction? The first 100 students from an alphabetical list of the entire school The first 100 students from an alphabetical list of sixth graders One hundred random students from the entire school One hundred random students from the sixth grade
well, like always, we want a random sample, and we want 6th graders, so our answer is...?
what do you think? which one has the higher mean?
no, look at the graphs carefully... which one has more dots on the right side?
grade 6 so A?
like we've said before... higher mean absolute deviation means higher variability...
b or d right?
well, which one has the greater mean?
yes, so our answer is A
ok thank you for everything :)
no problem, don't forget to medal. good night ~
goodnight! oh! can you answer these quick questions please ... really fast.. they are not problems they are just questions ..please :)
What are scale drawing? Give an example.
are you there?