1. A company wants to determine if their new employee training program has impacted sales per employee. Previously, the average sales per employee was $10,000 per month. They took a sample of 10 employees after the new training and found that the average sales per employee is $12,000 per month with a standard deviation of $1,500.
What is the correct test?
What is the case / direction?
2. A fast-food chain wants to know if the average calorie count in their new menu items is lower than the previous menu. They collect a sample of 10 menu items and find that the average calorie count is 500 calories. They want to test whether it is significantly less from the previous menu's calorie count of 550.
What is the correct test?
What is the case / direction?
3. An IT company wants to know whether their new product has worsened response time for users. They collect a sample of 50 users and find that the average response time is 2.5 seconds (SD = 0.4). They want to test whether it is slower than the previous product's mean response time of 2 seconds (SD = 0.6).
What is the correct test?
What is the case / direction?
4. A car dealership wants to test whether the average time it takes for a customer to complete a purchase is impacted after implementing a new sales strategy. They collect a sample of 50 customers and find that the average time it takes for them to complete a purchase is 90 minutes. They want to test whether has changed from the previous time, which was 120 minutes (SD = 17).
What is the correct test?
What is the case / direction?