# Question

Many homeowners rely on handymen to perform small jobs, such as repairs or maintenance, around their residence. According to HomeAdvisor Inc., the average cost for a handyman project is $ 460. Assume the population standard deviation is $ 95. A random sample of 30 handyman projects was selected.

a. What is the probability that the sample mean will be less than $ 475?

b. What is the probability that the sample mean will be between $ 450 and $ 465?

c. Identify the symmetrical interval that includes 95% of the sample means if the true population mean is $ 460 per project.

d. Suppose the sample mean was $ 411. Does this result support the findings of HomeAdvisor Inc.?

a. What is the probability that the sample mean will be less than $ 475?

b. What is the probability that the sample mean will be between $ 450 and $ 465?

c. Identify the symmetrical interval that includes 95% of the sample means if the true population mean is $ 460 per project.

d. Suppose the sample mean was $ 411. Does this result support the findings of HomeAdvisor Inc.?

## Answer to relevant Questions

In an effort to reduce health care costs, many companies are encouraging their employees to walk more. According to the Medicine & Science in Sports & Exercise Journal, Americans take an average of 5,117 steps per day. ...Urban planners will use electronic traffic counters to count the number of vehicles that travel on a specific road. This information can be used to identify roads that need to be improved or expanded based on traffic needs. ...The Excel file titled verizon.xlsx contains daily revenues for the past 350 business days earned from cell phone accessories (Bluetooth headsets, memory cards, and so on) sold at a local Verizon retail store in Delaware. a. ...The average selling price of BlackBerry smartphones purchased by a random sample of 35 customers was $ 311. Assume the population standard deviation was $ 35. a. Construct a 90% confidence interval to estimate the average ...Construct a 98% confidence interval to estimate the population mean when = 60 and σ = 12.2 for the following sample sizes: a. n = 20 b. n = 40 c. n = 60Post your question

0