Is there evidence that the mean first marriage age has

Reference no: EM13947328

1. Assume that the mean age at first marriage among females in in 2003 was 27 yrs old. A random sample of 144 females this year yielded a mean first marriage age of 29.5 with a standard deviation of 4 years. Assume that marriage ages were normally distributed. Is there evidence that the mean first marriage age has increased since 2003? Test the claim at 95% significance level.

a) Null hypothesis

b) Alternate hypothesis

c) P value

d) Conclusion

2. The 77th annual report of the New Mexico department of game and fish stated that the weight of an adult mountain lion is normally distributed. Given that a sample of n=36 adult mountain lions have a mean of 102 lbs and a standard deviation 30.7 lbs construct a 99% confidence interval estimate of population average weight of all adult mountain lions.

3. In an article exploring blood serum levels of vitamins and lung cancer risks in the new England journal of medicine the mean serum level of vitamin E in the control was 11.2 mg/litre with standard deviation = 4.1. There were 196 patients in the control group. Using this information construct a 90 % confidence interval for the mean serum level of vitamin E in all persons similar to the control.

4). The owner of a local nightclub was recently surveyed a random sample of n=100 customers of the club. She would now like to determine whether or not the mean age of her customers is over 35. If so she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. Suppose she found that the sample mean was 35.5 years and the population standard deviation was 5 years. What is the p value?

Reference no: EM13947328

Questions Cloud

Estimate the surface temperature of the fourth device : (a) Estimate the surface temperature of the fourth device located 15 mm from the leading edge of the board. (b) Generate a plot of the surface temperature of the first four devices as a function of the free stream velocity for 5 uoo 15 m/s.

Why is off-balance-sheet finance a problem in accounting : How does a five-year summary of historical results help investors? Which items are reported on a segmental basis? How are segments identified? Why is off-balance-sheet finance a problem in accounting?

Calculate the PB period-Discounted PB and IRR : The Postal Service has just awarded Steve an additional contract that will require Steve to purchase six new tractors. He competed aggressively for the contract and spent a total of $45,000 in costs to prepare and submit the bid. Steve has narrowed h..

Is there evidence that the mean first marriage age has : Assume that the mean age at first marriage among females in in 2003 was 27 yrs old. A random sample of 144 females this year yielded a mean first marriage age of 29.5 with a standard deviation of 4 years. Assume that marriage ages were normally distr..

Determine which tractor you recommend that steve purchase : Steve is a contract carrier for the United States Postal Service. He has been hauling mail for nearly thirty years. His current contract is to haul mail between 20 cities in the eleven western states. Steve currently has a fleet of 16 tractors and em..

What is the portfolio expected return : A portfolio is invested 26 percent in Stock G, 41 percent in Stock J, and 33 percent in Stock K. The expected returns on these stocks are 9 percent, 11.5 percent, and 16.9 percent, respectively. What is the portfolio’s expected return?

All-equity plan and levered plan : DAR Corporation is comparing two different capital structures: an all-equity plan (Plan I) and a levered plan (Plan II). Under Plan I, the company would have 150,000 shares of stock outstanding. What is the break-even EBIT?

Cash conversion cycle and firms operating cycle : Cash conversion cycle: American Products is concerned about managing cash efficiently. On the average, inventories have an age of 90 days, and accounts recievable are collected in 60 days. Accounts payable are paid approximately 30 days after they ar..

User Account

All Pages