Maganement at a radio station wants to know the number of songs it plays per hour. a random sample over the past month yields the following counts for songs per hour: 9,13,12,8,7,10,11,10,8,12,13,9,10,1 2, and 11.a. the radio station wants to claim that they play more than 10 songs per hour. what are the null and alternative hypotheses that test this statement? b. what test willyou use to evalute the alternative hypothesis? what are the conditions of this test? are they met in this situation? c. calculate your test statistic and p-value. show your work. d. what's your critical t value and your conclusion (at a=.05)

we conclude that the radio station does not play more than 10 songs per hour.

Step-by-step explanation:

We are given the following data set:

9,13,12,8,7,10,11,10,8,12,13,9,10,12,11

where are data points, is the mean and n is the number of observations.  

Sum of squares of differences = 49.34

We are given the following in the question:  

Population mean, μ = 10

Sample mean, = 10.34

Sample size, n = 15

Alpha, α = 0.05

Sample standard deviation, s = 1.88

First, we design the null and the alternate hypothesis

We use one-tailed t test to perform this hypothesis.

Formula:

Putting all the values, we have

Now,

Since,                    

We fail to reject the null hypothesis and accept the null hypothesis.  Thus, we conclude that the radio station does not play more than 10 songs per hour.

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.

28

step-by-step explanation:

because that's the answer