1a bank wants to get new customers for their credit card

Assignment Help Basic Statistics

Reference no: EM13353677

1. A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first brochure; of these, 100 get the credit card. A separate sample of 500 people are mailed the second brochure; 125 get the credit card. Are the two campaigns equally attractive to customers? Compute a 95% confidence interval for the difference in the two proportions.

A. (0.21, 0.29)
B. (-0.102, 0.002)
C. (-0.118, 0.018)

2. Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.

A. (0.845, 0.995)
B. (0.805, 0.973)
C. (0.819, 0.959)

3. A student believes that 20% of all students think pepperoni is their favorite pizza. He performs a test of hypothesis, H0: p = 0.2, having taken a sample of 200 students and finding that 52 think pepperoni is their favorite. He finds a p-value of 0.0338, so rejects the null at α = 0.05. He then computes a 95% confidence interval for the true proportion and finds it is (0.199, 0.321). He is confused. 20% is in the interval! What is the difference?

A. He made a mistake in one of his calculations.
B. The two use different values of p in computing the standard deviation.
C. He should have used the plus four confidence interval.

Reference no: EM13353677

Questions Cloud

1students often incorrectly believe that inference for a : 1.students often incorrectly believe that inference for a population proportion based on the sample proportion is

1i want to know which of two manufacturing methods will be : 1.i want to know which of two manufacturing methods will be better. i create 10 prototypes using the first process and

1i read an article about a new drug which stated that the : 1.i read an article about a new drug which stated that the incidence of side effects was similar to placebo p-value gt

1a poll finds that 54 of the 600 people polled favor the : 1.a poll finds that 54 of the 600 people polled favor the incumbent. shortly after the poll is taken it is disclosed

1a bank wants to get new customers for their credit card : 1.a bank wants to get new customers for their credit card. they try two different approaches in their marketing

1a manufacturer receives parts from two suppliers an srs of : 1.a manufacturer receives parts from two suppliers. an srs of 400 parts from supplier 1 finds 20 defective. an srs of

1a noted psychic was tested for esp the psychic was : 1.a noted psychic was tested for esp. the psychic was presented with 400 cards face down and asked to determine if each

1a manufacturer receives parts from two suppliers an srs of : 1.a manufacturer receives parts from two suppliers. an srs of 400 parts from supplier 1 finds 20 defective. an srs of

1an inspector inspects large truckloads of potatoes to : 1.an inspector inspects large truckloads of potatoes to determine the proportion p with major defects prior to using

User Account

All Pages