The current national gas price is stated to be at an average of $2.45 per gallon
ID: 3361748 • Letter: T
Question
The current national gas price is stated to be at an average of $2.45 per gallon with a standard deviation of $0.18. We decide to take a random sample of 36 gas stations.
What is the probability that the mean price of gasoline at these gas stations is less than $2.49?
Why did we conclude that mean cold length not differs by “medication” ? Is this Independent sample or dependent (paired sample)?
Create summary statistics (mean, median, std. dev., etc) “grouped by” Zicam. Use this summary information to help you perform the appropriate hypothesis test (by utilizing new StatCrunch output after going to Stat-T Statistics – Two Sample – with summary) to determine if mean cold length differs by “medication”, and if so how? Be sure to show all steps, provide appropriate output, and use a 5% significance level.
Based on your decision above (d), does taking the medicine make a difference? Why or why not? D) When looking at how long cold days are for Americans aged 18-64 we can see that the shape of the data is skwed right and unimodal with an outlier falling at 22.5 days. The mean cold length was 9.06 days with half 50% of the colds lasting at least 8 days. The typical cold length fell between 5.34 and 12.69 days.
Summary statistics:
Summary statistics for Length:
Group by: Zicam
Two sample T summary hypothesis test:
1 : Mean of Population 1
2 : Mean of Population 2
1 - 2 : Difference between two means
H0 : 1 - 2 = 0
HA : 1 - 2 0
(without pooled variances)
Hypothesis test results:
Explanation / Answer
Solution-
After conducting the hypotheis test, we have p-value = 0.3614 which is greater than 0.05.
Hence we do not reject the null hypothesis at 5% level of significance.
Thus taking medicine does not make a difference.
Answer
TY!
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