Which of the following shows the graphic representation of the exponential function f (x) = 3^x
1 answer:
Answer:
The graph in the attached figure
Step-by-step explanation:
we have
This is a exponential growth function of the form
where
a is the initial value or y-intercept
r is the rate of change
In this problem we have
The y-intercept of the graph is (0,1)
Find different values of f(x) for different values of x
For x=1 ----> -----> point (1,3)
For x=2 ----> -----> point (2,9)
For x=3 ----> -----> point (3,27)
Plot the points and join them to graph the function
see the attached figure
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Answer:
If we compare the p value and the significance level given we see that
so we can conclude that we have enough evidence to to reject the null hypothesis, so we can conclude that the true mean is different from 1 pound at 5% of signficance.
Step-by-step explanation:
Data given and notation
represent the sample mean
represent the population standard deviation
sample size
represent the value that we want to test
represent the significance level for the hypothesis test.
z would represent the statistic (variable of interest)
represent the p value for the test (variable of interest)
State the null and alternative hypotheses.
We need to conduct a hypothesis in order to check if the true mean is equal to 1 pound or no :
Null hypothesis:
Alternative hypothesis:
Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:
(1)
z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".
Calculate the statistic
We can replace in formula (1) the info given like this:
P-value
Since is a two-sided test the p value would be:
Conclusion
If we compare the p value and the significance level given we see that
so we can conclude that we have enough evidence to to reject the null hypothesis, so we can conclude that the true mean is different from 1 pound at 5% of signficance.