Answer:
Each person spent $10.
Step-by-step explanation:
Let the money spent by each friend = $x
Number of persons including Donovan = 4
Total amount spent by all friends all together = $4x
Since each spent half of their money on rides so amount spent on rides = = $2x
Then they each spent $3 on food so total money spent = $(2x + 12)
Remaining money = $8
Now the equation will be
$4x - $(2x + 12) = $8
4x - 2x - 12 = 8
2x - 12 = 8
2x = 12 + 8
x = $10
Therefore, each friend spent $10.
Answer:
The degrees of freedom are given by:
The p value can be calculated like this:
For this case since the p value is higher than the significance level we have enough evidence to conclude that the true mean for the wait time is not significantly less than 8 minutes
Step-by-step explanation:
Information given
represent the sampke mean in minutes
represent the sample standard deviation
sample size
represent the value to verify
represent the significance level
t would represent the statistic (variable of interest)
represent the p value
System of hypothesis
For this case we are trying to proof if inspection station advertises that the wait time for customers is less than 8 minutes, the system of hypothesis would be:
Null hypothesis:
Alternative hypothesis:
Since the population deviation is not known the statistic can be calculated with:
(1)
The statistic for this case is given by:
The degrees of freedom are given by:
The p value can be calculated like this:
For this case since the p value is higher than the significance level we have enough evidence to conclude that the true mean for the wait time is not significantly less than 8 minutes