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An electrical firm manufactures a certain type of light bulb that has a mean life of 1800 hours and a standard deviation of 200 hours. Assume the life of these light bulbs follows a normal distribution.
a. Find the probability that a single light bulb will have a life greater than 2000 hours.b. Find the probability that a random sample of 100 light bulbs will have an average life between 1760 and 1775 hours.
Use a Normal approximation to find the probability that 75% or more of the women in the sample have been on a diet.
Develop a model that determines your round-trip gasoline cost. What assumption or approximations are necessary to treat this model as deterministic model?
Assume that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices.
She decided to investigate and gather the following sample information. Would it be reasonable for her to conclude that union nurses earn more? Use the .02 significance level. What is the p value?
What are the Chi-square results? What are the expected and the observed results that were found? Are they results of the Chi-Square significant? What do the results mean?
A random sample of 43 light bulbs has a mean life of 677 hours with a standard deviation of 90 hours. Do you have enough evidence to reject the manufacturer's claim?
If we believe the manufacturer's assertion, what is the probability that at most 3 of the 6 seeds that were planted will germinate?
Machine is not filling the bottles completely. A sample of 8 bottles is taken. Is there enough evidence to support the consumer's conjecture at alpha = .10?
A random sample of 61 accounts were checked. The standard deviation was $286.20. At α= 0.01, test the firms' assumption. Assume the account balances are normally distributed.
A TIE of at least 4.0, and if the TIE falls below this level the bank will call in the loan and the firm will go bankrupt. What is the maximum debt ratio the firm can use?
Negatively correlated and that the area of the home and the selling price are positively correlated? Use the .05 significance level. Report the p- value of the test.
Choose any Statistic business problem and develop a problem statement which can be addressed with survey research. Prepare a 10-13 question survey to collect primary data regarding your selected problem statement.
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