To estimate the mean number of text messages sent by cell-phone users, a researcher chooses a location on a college campus in the city and surveys the first 50 people who walk past. These subjects are asked how many text
messages they have sent in the past 24 hours. Is it likely that bias will be present in the sample?
Because this is a convenience sample, it is likely that the sample results will be unbiased.
Because this is a convenience sample of college students, it is likely that bias is present and that the results will
overestimate the mean number of text messages sent.
Because this is a convenience sample of college students, it is likely that bias is present and that the results will
underestimate the mean number of text messages sent.
Because this is a voluntary response sample of college students, it is likely that bias is present and that the resul
will overestimate the mean number of text messages sent.

is means division by fractions

step-by-step explanation:

30

step-by-step explanation:

idk

i hope i

the correct answer is you spend $55.78 more in a brand store that buy ing in a normal store.

step-by-step explanation:

brand = spend   $ 135.85 total

store = spend $80.07 total

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.