When conducting a paired differences test, what is the value of n? the total number of data values. the total number of data values minus 1. the number of data pairs minus 1. the number of data pairs.

The number of data pairs minus 1.

Step-by-step explanation:

Paired test is a hypothesis test for comparing two pairs of data. NOrmally same items selected are subject to two different treatments and means are recorded and the differences are found out.

The differences are normally distributed and hence hypothesis test is done normally with d = difference =0 as null and alternate not equal to 0, or >0 or less than 0 as the need may be

The test statistic is the same as d difference between observed and 0 divided by standard error of the sample

Here degree of freedom would be n-1 where n is the number of data in any one pair

Hence  correct answer is

The number of data pairs minus 1.

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.

7

step-by-step explanation: