# Question: The investment website of Exercise 1 draws a random sample

The investment website of Exercise 1 draws a random sample of 200 investors from their customers. Suppose that the true proportion of smart phone users is 36%.

a) What would the standard deviation of the sampling distribution of the proportion of smart phone users be?

b) What is the probability that the sample proportion of smart phone users is greater than 0.36?

c) What is the probability that the sample proportion is between 0.30 and 0.40?

d) What is the probability that the sample proportion is less than 0.28?

e) What is the probability that the sample proportion is greater than 0.42?

a) What would the standard deviation of the sampling distribution of the proportion of smart phone users be?

b) What is the probability that the sample proportion of smart phone users is greater than 0.36?

c) What is the probability that the sample proportion is between 0.30 and 0.40?

d) What is the probability that the sample proportion is less than 0.28?

e) What is the probability that the sample proportion is greater than 0.42?

**View Solution:**## Answer to relevant Questions

In a really large bag of M&M’s, we found 12% of 500 candies were green. Is this evidence that the manufacturing process is out of control and has made too many greens? Explain. Based on past experience, a bank believes that 7% of the people who receive loans will not make payments on time. The bank has recently approved 200 loans. a) What are the mean and standard deviation of the proportion of ...Just before a referendum on a school budget, a local newspaper polls 400 voters in an attempt to predict whether the budget will pass. Suppose that the budget actually has the support of 52% of the voters. What’s the ...A real estate agent wants to know how many owners of homes worth over $1,000,000 might be considering putting their home on the market in the next 12 months. He surveys 40 of them and finds that 10 of them are considering ...In Canada, the vast majority (90%) of companies in the chemical industry are ISO 14001 certified. The ISO 14001 is an international standard for environmental management systems. An environ-mental group wished to estimate ...Post your question