A random sample of 1500 residential telephones in Phoenix found that 394 of the numbers were unlisted. A random sample in the same year of 1200 telephones in Scottsdale found that 313 were unlisted. A. Find a 95% confidence interval on the difference in the two proportions and use this confidence interval to determine 2010 whether there is a statistically significant difference in proportions of unlisted numbers between the two cities.
B. Find a 90% confidence interval on the difference in the two proportions and use this confidence interval to determine 2010 whether there is a statistically significant difference in proportions of unlisted numbers for the two cities.

d

step-by-step explanation:

hello and welcome!

so, when we see the words "proportional" along with a table, we need to know that we're looking numbers that divide by the same thing.

looking at this table, we simply have to do a trial and error, and divide to see which numbers have the same quotient. if you look at choice a & c, they both have equal quotients for three of the numbers, with one exception, so those can't be the answer. looking at b, there is no similarity, so that can't be it. then, we see d; if you divide all the numbers in the table, you'll see that they all divide by two, which is a proportional relationship, and our answer!

also, always remember that the x will always be the number that goes into y, and somewhere behind this table, is a formula. for this specific table, the formula would be:

since our x-value is being divided by two to get the y-value. and if they were to ask for more numbers in the series, this is the formula you would use to find them.

the answer is 31.27mph

so then what are you asking?

step-by-step explanation:

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x