### Conduct a test at the 5% level of significance if Instagram

**Assignment Detail:- ** BSB123 Data Analysis - Queensland University of Technology
Question OneScores on a government psychometric test are normally distributed with a mean of 150 and a standard deviation of 25-a- What is the probability an applicant scores more than 120 on the test????b- What score would the top 20% of applicants achieve????
Question TwoEight percent of the worlds population have blue eyes-a- What is the probability that in a sample of 200 students more than 10% have blue eyes????b- Answer the same question if the sample was only 100 students-
Question ThreeIn your excel spreadsheet there is a worksheet on Instagram v Facebook usage for different age groups-a- Conduct a test at the 5% level of significance if Instagram usage among Under 50'S is more than 60%-b- Conduct a test at the 1% level of significance if the proportion of Under 50's who use Instagram is more than the proportion of 50 and overs-
Question FourIn your excel spreadsheet there is a worksheet called on-line retailer-a- An online retailer is looking at the changing trends in sales since pre-covid and 2022-b- In pre-covid years the standard deviation in sales was $25- While overall spending online has increased, the retailer believes that the variance in sales has also increased- Test at the 5% level of significance if the variance of sales in 2022 is more than the previous $625-Conduct a test to see if the average spend of customers in 2022 is more than that in 2019-
Attachment:- Data Analysis-rar

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