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NEW QUESTION 37
The sales grocery store had an average of $8000 per day. The store introduced several advertising campaigns in order to increase sales. To determine whether the advertising campaigns have been effective in increasing sales, a sample of 64 days of sales was selected, and the sample mean was $8000 per day.
The correct null and alternative hypotheses to test whether there has been a significant increase are
- A. Null Sample mean is $8000; Alternative Sample mean is greater than $8000.
- B. Null Population mean is $8000; Alternative; Population mean is greater than or equal to $8000.
- C. Null Sample mean is $8000; Alternative Sample mean is greater than or equal to $8000.
- D. Null Population mean is $8000; Alternative; Population mean is greater than $8000.
Answer: D
Explanation:
Since you are trying to determine whether sales increased above the current average of $8000, the population mean for the null hypothesis is $8000; whereas the mean for the alternative hypothesis is greater than $8000. Hypotheses are always stated in terms of population you are working with, ruling out options A and B.
The test is whether sales are higher than the average of $8000 per day, which rules out option C.
NEW QUESTION 38
Which one of the following programming languages is specifically designed for use in analytics applications?
- A. R
- B. Java.
- C. C++
- D. Python.
Answer: A
NEW QUESTION 39
Data definitions should be written in plain language.
- A. False.
- B. True.
Answer: B
NEW QUESTION 40
You are working with a dataset and want to change the names of categories that you used for different types of books.
What term best describes this action?
- A. Filtering.
- B. Recording.
- C. Summarizing
- D. Aggregating.
Answer: B
NEW QUESTION 41
An e-commerce company recently tested a new website layout. The website was tested by a test group of customers, and an old website was presented to a control group. The table below shows the percentage of users in each group who made purchases on the websites:
Which of the following conclusions is accurate at a 95% confidence interval?
- A. In Germany, the increase in conversion from the new layout was not significant.
- B. The new layout has the lowest conversion rates in the United Kingdom.
- C. In general, users who visit the new website are more likely to make a purchase.
- D. In France, the increase in conversion from the new layout was not significant.
Answer: C
NEW QUESTION 42
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