According to nielsen media research. of all the u. s. households that owned at least one television set, 83% had two or more sets. a local cable company canvassing the town to promote a new cable service found that of the 300 households visited, 240 had tow or more television sets. at  α= .05 proportion is less than the one in the report. 

The proportion of U.S. households that owned two or more televisions is 83%.

Step-by-step explanation:

To determine whether the proportions of U.S. households that owned two or more televisions is less than 83% or not let us perform a hypothesis test for single proportion.

Assumptions:

The sample size (n) selected by the local cable company is 300 which is quite large. Then according to the Central limit theorem the sampling distribution of sample proportion follows a normal distribution with mean p and standard deviation .

Since the sampling distribution of sample proportions follows a normal distribution use the z-test for one proportion to perform the test.

The hypothesis is:

: The proportion of U.S. households that owned two or more televisions is 83%, i.e.

:The proportion of U.S. households that owned two or more televisions is less than 83%, i.e.

Decision Rule:

At the level of significance α = 0.05 the critical region for a one-tailed z-test is:

**Use the z table for the critical values.

So, if the null hypothesis will be rejected.

Test statistic value:

Here is the sample proportion.

Compute the value of as follows:

Now compute the value of the test statistic as follows:

The test statistic is -1.383 which is more than -1.645.

Thus, the test statistic lies in the acceptance region.

Hence we fail to reject the null hypothesis.

Conclusion:

At 0.05 level of significance we fail to reject the null hypothesis stating that the proportion of U.S. households that owned two or more televisions is  83%.

answer: the dogs need to shift their focus to human scent.

its because the dogs being trained are for search and rescue thus they need to be able to track humans and their specific scent

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3