B Mrs. Sayers made a rectangular fence
1 answer:
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Answer:
The statement is True.
Step-by-step explanation:
In this case we need to determine whether the rubber bands in a package of a particular brand of rubber band can hold a weight of 7 lbs or less.
A one-sample test can be used to perform the analysis.
The hypothesis can be defined as follows:
<em>H₀</em>: The mean weight the rubber bands can hold is 7 lbs, i.e. <em>μ</em> = 7.
<em>Hₐ</em>: The mean weight the rubber bands can hold is less than 7 lbs, i.e. <em>μ</em> < 7.
The information provided is:
As the population standard deviation is provided, we will use a <em>z</em>-test for single mean.
Compute the test statistic value as follows:
The test statistic value is -1.20.
Decision rule:
If the p-value of the test is less than the significance level then the null hypothesis will be rejected.
Compute the <em>p</em>-value for the two-tailed test as follows:
*Use a z-table for the probability.
The p-value of the test is 0.1151.
The <em>p</em>-value of the test is very large for all the commonly used significance level. The null hypothesis will not be rejected.
Thus, it can be concluded that the mean weight the rubber bands can hold is 7 lbs.
Hence, the statement is True.
Answer:
68.20°
Step-by-step explanation:
Using Pythagoras rule :
Tanθ = opposite / adjacent
Adjacent = 8ft
Opposite = 20
Tanθ = 20 / 8
θ = tan^-1(20/8)
= 68.198590
Hence, angle of elevation = 68.2°
