Amusic industry professional claims that the average amount of money that an average teenager spends per month on music is at least $50. based upon previous research, the population standard deviation is estimated to be $12.42. the music professional surveys 20 students and finds that the mean spending is $47.77. is there evidence that the average amount spent by students is less than $50 at a significance level of 0.10?

We conclude average amount of money that an average teenager spends per month on music is at least $50. There is not enough evidence to

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = $50

Sample mean, = $47.77

Sample size, n = 2-

Alpha, α = 0.10

Population standard deviation, σ = $12.42

First, we design the null and the alternate hypothesis

We use one-tailed(left) z 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 average amount of money that an average teenager spends per month on music is at least $50. There is not enough evidence to support the claim.

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.  

if gloria has "carry over" minutes, (that is, any minutes paid for but not used in a month can be applied to her payment for minutes in the next month,) her total usage for the three months is: total minutes = 320 + 243 + 489 = 1052 minutes number of 200 minute blocks = 1052/200 = 5 r52 (that is 5 with a remainder of 52) rounding up the number of 200 minute blocks gives her usage for the three months as 6 blocks. the cost for six blocks is 6 x $25 = $150 she also has 200 - 52 or 148 carry over minutes if gloria pays each month and unused minutes are lost, applying the rounding up procedure to each month gives: first month usage of 320 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 second month usage of 243 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 third month usage of 489 minutes rounds up to 3 blocks of 200 minutes for a payment of 3 x $25 = $75 total payments for the three months are $50 + $50 + $75 = $175 get the plan with carry over minutes!