# Recent content by StrongStats

1. ### Urgent - Easy problems that I need help with

Question 3b. Suppose that the failure rate is known to be exactly 0.014 failures per day. What is the probability that the machine will operate for the next 30 days with no failures? #Q6 (3b) 1-pexp(30,rate=0.014) #[1] 0.6570468 #Answer=0.6570
2. ### Urgent - Easy problems that I need help with

Question 3a. An expensive machine has had 14 failures in the past 1095 days. (More than one failure can occur on a single day, although this is unlikely.) If the failure rate is a constant that must be estimated from data, what is a 95% upper confidence limit for the failure rate (average...
3. ### Urgent - Easy problems that I need help with

Question 2c. Do the data show that, with at least 95% confidence, the fraction of exposed customers with “favorable” or “very favorable” perceptions of the brand is at least 22%? What is the smallest true probability of a “favorable” or “very favorable” response that makes the probability of...
4. ### Urgent - Easy problems that I need help with

Question 2 A study of ad effectiveness found that 20% of consumers who had not yet been exposed to a new advertising campaign (the “control group”) reported having a “favorable” or “very favorable” perception of a certain brand. By contrast, out of a simple random sample of 400 consumers who...
5. ### Urgent - Easy problems that I need help with

Hello, I will post the question, then my answer. I am doing something wrong. Can anyone help me figure it out? Question 1. To estimate how many 100,000 potential customers might buy a new product, the product is offered for sale to a random sample of 100 of the potential customers. 15 of the...