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Question: a grocery store owner wants to know if a new...

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a grocery store owner wants to know if a new marketing campaign will

Take+home+Exam+1-SPR2019) Mailings ReviewView Normal No Spacing Heading 1 Heading 2 A grocery store owner wants to know if a new marketing campaign will improve the average number of customers who visit the store on a given day. The owner knows that historically they average 490.2 customers per day. After the campaign the owner randomly samples 28 days and finds an average of 512.1 customers with a standard deviation of 83.2. Did the new campaign increase the average number of customers who visit the grocery store? 1. Identify the appropriate test, alpha, and check assumptions Two sample t test Alpha 05 Assumptions means are the same 2. Formulate hypotheses 3. Perform calculations (test statistic & P-value) 4. Compare P-value to alpha and state conclusion 5. Write your conclusion in English
Take+home+Exam+1-SPR2019) Question 3 A production manager wants to know if her new procedure results in fewer defective units. She knows that they are currently averaging 8% defective units. She then collects a sample of 341 units using the new procedure and finds 24 defective units. Do we have enough evidence to conclude that the new procedure results in fewer defective units? (use alpha .05) 1. Identify the appropriate test, alpha, and check assumptions 2. Formulate hypotheses 3. Perform calculations (test statistic & P-value) 4. Compare P-value to alpha and state conclusiorn 5. Write your conclusion in English
авьсс Normal Question 4 A company wants to know if their new lightbulbs last longer than the published specification of their main competitor. Their competitor claims that their lightbulbs last for an average of 2400 hours. The company selects a random sample of 100 lightbulbs and finds that they averaged 2500 hours with a standard deviation of 125 hours. Do they have sufficient evidence to conclude that their lightbulbs last longer than their competitor? (use 90% confidence) 1. Identify the appropriate test, alpha, and check assumptions 2. Formulate hypotheses 3. Perform calculations (test statistic & P-value 4. Compare P-value to alpha and state conclusion 5. Write your conclusion in English
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