+61-413 786 465

info@mywordsolution.com

## Statistics

problem1) Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable CD player. But tests on a random sample of 18 batteries from a day's large production run showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. What would be the teststatistic to test DullCo's hypothesis?

problem2) What are the null and alternative hypotheses for the Dullco test?

problem3) In the Dullco ex, we would be performing what type of hypothesis test?

problem4) If α=.02, what would be the critical value for the Dullco test?

problem5) What is the risk of type I error if the U.S. military mobilizes troops to prepare for a missile attack from North Korea, but North Korea does not carry out an attack? Who will likely bear the costs of this error?

problem6) If a manager is told that there is possibly a safety issue related to a manufacturing process under their purview but decides not to run tests to detect the problem, what type of error is the manager exposed to?  What are the consequences of this type of error, and to whom?

problem7) If a research and development team is testing a new blood pressure medicine to see if it maintains patients’ average blood pressure at a significantly lower level than does the current industry standard, what sets of hypotheses would they use?

problem8) When do we make use of chi-squared tests and/or F-tests? In other words, what parameter do we want to know about, and which statistics are we using to make inferences about this parameter?

problem9) Which of the following statements is (are) true when we reject the null hypothesis?

a) The find outd value associated with our sample is extreme enough that we find it unlikely that this level of difference is merely due to chance.
b) We conclude that there is not enough difference in the sample for us to consider taking action.
c) The probability of a value as extreme or more extreme that the value we observed is smaller than the probability we chose as our “cutoff” point (the value at which we begin to conclude that there is a statistically significant difference).
d) Both a. and c. are correct.

problem10) Which of the following is true of paired T-tests?

a) One time they are used is when two samples are taken on the same individuals.
b) They are never used for “before and after” tests.
c) They are only used when σ2 is known
d) The paired t-test is preferred to chi-squared tests because it is more conservative.

problem11) If two CNC machine shops were competing for a contract to make rivets to a certain specification, what test would we use to test if there were differences in the variability of their products?

problem12) True or False? The degrees of freedom for the t-test used to compare two population means (independent samples) with unknown variances (assumed equal) will be n1 + n2 - 2.

problem13) True or False? The test statistic (F-find outd value) in an F test for equal variances is the ratio of the sample variances.

problem14) In a left-tailed test comparing two means with variances unknown but assumed to be equal, the sample sizes were n1 = 8 and n2 = 12. At α = .05, the critical value would be:

problem15) True or False? Alpha and beta can never be simultaneously reduced, even though that would be a desirable situation. describe your answer.

Statistics and Probability, Statistics

• Category:- Statistics and Probability
• Reference No.:- M9637

Have any Question?

## Related Questions in Statistics and Probability

### Assume that the mean score on a normally distributed

Assume that the mean score on a normally distributed statistics quiz taken by 400 psychology students was 76, and the standard deviation was 8. Ben had a z-score of -1.2. If someone gave a passing grade only to the top 2 ...

### Across the nine cities in multilevel multivariate analysis

Across the nine cities, in multilevel, multivariate analysis, controlling for income inequality (GINI coefficient), percent living in poverty and percent Non-Hispanic Black population, the ZIP code level overall HIV diag ...

### A puck company wants to sponsor the players with the 20

A puck company wants to sponsor the players with the 20% quickest goals in hockey games. The times of first goals are normally distributed with a mean of 8.54 minutes and a standard deviation of 4.91 minutes. How fast wo ...

### What are some differences between transaction processing

What are some differences between Transaction Processing Information Systems and Management Information Systems?

### Question 387 women receiving free bone mineral density

Question: 387 women receiving free bone mineral density screenings were questioned. The questions focused on past smoking history. Sujbects undergoing hormone replacement therapy (HRT), and subjects not undergoing HRT, w ...

### For an environmental group it is known that 75 of their

For an environmental group, it is known that 75% of their door-to-door solicitations result in a donation of some kind. Find the probability that... (Hint: first determine what is a 'success' and what is a 'failure' base ...

### Assume that the significance level is alpha equals alpha005

Assume that the significance level is alpha equals α=0.05. Use the given statement and find the? P-value and critical? value(s). The test statistic of z equals = -1.53 is obtained when testing the claim that p= 1/6 P-val ...

### Question the probability a beginning golfer makes a good

Question: The probability a beginning golfer makes a good shot if he selects the correct club is 1/3. The probability the shot is good with the wrong club is 1/5. In his bag are four different clubs, only one of which is ...

### Lee smith imports paid a 100 per share annual dividend last

Lee Smith Imports paid a \$1.00 per share annual dividend last week. Dividends are expected to increase by 5% annually. What is one share of this stock worth to you today if the appropriate discount rate is 14%? a. \$7.14 ...

### A jar of peanut butter contains 451 grams with a standard

A jar of peanut butter contains 451 grams with a standard deviation of 10.6 grams. Assuming a normal distribution, find the probability that a jar contains less than 448 grams.

• 13,132 Experts

## Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

### Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

### Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

### Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of \$ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

### Compute the present value of an 1150 payment made in ten

Compute the present value of an \$1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

### Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of \$ 699 per year for 19 years, given a discount rate of 6 percent per annum. As