A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than three percentage points question marks?
a) Assume that nothing is known about the percentage of computers with new operating systems.
n=___
b) Assume that a recent survey suggests that about 85% of computers use a new operating system.
n=____
c) Does the additional survey information from part (b) have much of an effect on the sample size that is required?
In: Statistics and Probability
1. In a clinical trial for the effectiveness of a new treatment for the flu, some people were given the new treatment while others received a placebo, Of the 400 people that were given the new treatment, 300 of them saw improvements. Of the 169 people that received the placebo, 120 saw improvements. Use a 0.05 significance level to test the claim that there is no difference in the proportion of people that saw improvements whether or not they receive the new treatment.
(a) Find the null hypothesis, H0 and the alternative hypothesis, H1.
(b) Find the test statistic, z.
(c) Find the critical region.
(d) Determine whether we can reject the null hypothesis or not
In: Statistics and Probability
Suppose that Anu’s utility function is given by U = √10W, where W represents annual income in thousands of dollars. Suppose that Anu is currently earning an income of $40,000 (I = 40) and can earn that income next year with certainty. She is offered a chance to take a new job that offers a 0.6 probability of earning $44,000 and a 0.4 probability of earning $33,000. a. Should she take the new job? b. Assume Anu takes the new job. Would she be willing to buy insurance to protect against the variable income associated with the new job? If so, how much would she be willing to pay for that insurance?
In: Economics
A new client has been paying its suppliers late consistently;
well in excess of the suppliers’ agreed credit terms. As a result,
some suppliers have begun demanding cash on delivery from the
client. You are also aware that a review of correspondence between
the new client and its bank reveals that the new client has been
experiencing cash flow problems for two years.
Required
Discuss THREE events or conditions described in the case that may
cast significant doubt on the new client’s ability to continue as a
going concern, and briefly explain why these vents or conditions
could indicate going concern issues.
In: Accounting
A firm is evaluating a new capital project. The firm spent $45,000 on a market study and $30,000 on consulting three months ago. If the firm approves the project, it will spend $800,000 on new machinery, $60,000 on installation, and $10,000 on shipping. The machine will be depreciated via simplified straight-line depreciation over its 12-year life. The expected sales increase from this new project is $500,000 a year, and the expected incremental expenses are $200,000 a year. In order to start this new project, the company will invest $100,000 in working capital. The marginal tax rate is 40%. What is the annual net cash flow per year from this project?
In: Finance
(a)The total water potential of an algal cell is -1.7MPa and solute potential within the cell is -2.6 MPa. The algal cell is placed in a large volume of 0.95 Molar sucrose solution at 20 celcius. will the water potential of the algal cell change? If so, what will be the new water potential? If solute potential does not change , what will be the new pressure potential?
(B) After the algal cell had equilibrated to the 0.95 Molar sucrose solution, it was then transferred to a larger volume of a 0.4 Molar NaCl solution at 30 celcius.What will be the new water potential of the algal cell after equilibrium? If solute potential does not change,, what will be the new pressure potential?
In: Biology
your firm is evaluting a new capital project. the firm spent 45000
on a market study anf 30,000 on consulting three months ago. if the
firm approves the project, it will spend 900,000 on new machienry
80,000on installation and 10,000 on shipping. the machien will
depreciated via simplified straight line deprecation over its 18
year life. the excepected increase from this new project is 800,000
a year and the expected incremental expenses are 300,000 ayear. in
order to start this new project the company will invest 100,000 in
working capital. the marginal tax rate is 34%. what is the annual
net cash flow per year from this project ???
In: Finance
As of Friday morning, health officials have confirmed at least 39,140 total cases in New York State. The estimated population of the state was19.45 million residents in 2019.
1- Construct a 99% confidence interval of the percentage of New Yorkers likely infected and interpret your results. National Institute of Allergy and Infectious Diseases director Anthony Fauci says 1/1000 New Yorkers likely infected.
2- Many others claim that the percentage of infected New Yorkers is higher than what Dr. Fauci says. Please, conduct appropriate test of hypothesis to test that claim using a significance level 0.01
In: Statistics and Probability
A company claims that a new manufacturing process changes the mean amount of aluminum needed for cans and therefore changes the weight. Independent random samples of aluminum cans made by the old process and the new process are taken. The summary statistics are given below. Is there evidence at the 5% significance level (or 95% confidence level) to support the claim that the mean weight for all old cans is different than the mean weight for all new cans? Justify fully!
The Old process had a sample of size 25 with a mean of 0.504 and standard deviation of 0.019. The New process had a sample of size 25 with a mean of 0.495 and standard deviation of 0.021.
In: Statistics and Probability
OPEC has certainly been the world's most successful cartel. What did OPEC do to prevent the competition of capitals or creative destruction?
a. it suppressed innovations in new technologies and kept other producers out of the market
b. it managed to keep new technologies and new producers out of the market through monopolistic practices and collusion
c. it was unable to develop strategies to stop or slow down either of these competitions
d. it got the world court to recognize its patents in oil technologies and sued any firm or company that sought to enter the oil market e. it refused to allow new producers to enter the market
In: Economics