Ask Question, Ask an Expert

+61-413 786 465

info@mywordsolution.com

Ask Statistics and Probability Expert

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

If a study was done to measure the total brain volume of

If a study was done to measure the total brain volume of patients that had schizophrenia and also of patients that are normal. Table 1 has the total brain volume of the normal patients and table 2 has the total brain vol ...

A process is normally distributed with a mean of 104

A process is normally distributed with a mean of 104 rotations per minute and a standard deviation of 8.2 rotations per minute. If a randomly selected minute has 128 rotations per minute, would the process be considered ...

A professor records the following final exam scores 68 6 m

A professor records the following final exam scores: 68 6 (M SD). Students scoring in the top 18% get an A. What is the cutoff score for the top 18% in this example?

In a sample of 28 cups of coffee at the local coffee shop

In a sample of 28 cups of coffee at the local coffee shop, the average temperature was 162.5 degrees with a standard deviation of 16.7 degrees. What would be the 95% confidence interval for the temperature of your cup of ...

A suppose you purchase a 3-year zero-coupon bond with face

(a) Suppose you purchase a 3-year zero-coupon bond with face value of $1000 and a price of $850. What is the bond's yield? If you hold the bond to maturity, what will be your effective annual return? (b) Now suppose you ...

The random variablenbspxnbsptakes on the values 5 20 30 and

The random variable  X  takes on the values 5, 20, 30, and 200 with probabilites 0.60, 0.30, 0.08, and 0.02 respectively.  Use the statistical capacity of your calculator to find the expected value of  X rounded to one p ...

Doctoral assistant ships of phd students 50 have paid

Doctoral assistant ships of Ph.D students 50% have paid assistant ships. a random sample of n=200 students is chosen.. based on this sample and using the properties of the binomial distribution, what is the approximate s ...

On a correlation matrix you will usually see two values per

On a correlation matrix, you will usually see two values per comparison. The top value for a correlation measurement will be the Pearson correlation, right under that you will see a p-value. I understand when you have a ...

What is the sample size for studies with moe of -35 and -28

What is the sample size for studies with MOE of +/-3.5% and +/-2.8%, with a confidence level of 95%, sample statistics of 50. Suppose the category population was 7500 (less than 10,000)? Remember the FPC. What would be t ...

1 table 1016 contains the value of the house and the amount

1 Table #10.1.6 contains the value of the house and the amount of rental income in a year that the house brings in ("Capital and rental," 2013). Create a scatter plot and find a regression equation between house value an ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

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.

Ask Now Help with Problems, Get a Best Answer

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