14 x 3/5 plz help thanks
2 answers:
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Answer:
a.The advertising campaigns increased the average daily sales.
Step-by-step explanation:
This is a hypothesis test for the population mean.
The claim is that the advertising campaigns increased the average daily sales.
Then, the null and alternative hypothesis are:
The significance level is 0.05.
The sample has a size n=100.
The sample mean is M=7280.
The standard deviation of the population is known and has a value of σ=1000.
We can calculate the standard error as:
Then, we can calculate the z-statistic as:
This test is a right-tailed test, so the P-value for this test is calculated as:
As the P-value (0.0026) is smaller than the significance level (0.05), the effect is significant.
The null hypothesis is rejected.
There is enough evidence to support the claim that the advertising campaigns increased the average daily sales.
Answer:
4*3 - 3*3;
Joe read 3 more books than Craig
Step-by-step explanation:
Given
Craig:
3 books weekly for 3 weeks
Joe:
4 books weekly for 4 weeks
Required
How many more books did Joe read.
First, we need to determine number of books Craig reads
If in a week, Craig reads 3 books
Then in 3 weeks, Craig reads 3 * 3 books
Next, we need to determine number of books Joe reads
If in a week, Joe reads 3 books
Then in 4 weeks, Joe reads 4 * 3 books
Next, we determine the difference;
Hence, Joe reads 3 more books
Option D answers the question.