844 Answered Questions for the topic Statistics Question

Find the test statistic and the p-value.

Independent random samples, each containing 70 observations, were selected from two populations. The samples from populations 1 and 2 produced 59 and 49 successes, respectively. Test H0:(p1−p2)=0... more

state the null and alternative hypothesis, find the test statistic.

In a study of red/green color blindness, 1000 men and 2850 women are randomly selected and tested. Among the men, 90 have red/green color blindness. Among the women, 8 have red/green color... more

State the null and alternate hypotheses and find the degree of freedom.

Sue thinks that there is a difference in quality of life between rural and urban living. She collects information from obituaries in newspapers from urban and rural towns in Idaho to see if there... more

probability question help please!!!

Four cards are drawn from a standard deck. No cards are returned.a) Which is more likely:Event A: drawing a straight (four consecutive cards e.g. 5, 6, 7, 8), orEvent B: drawing four consecutive... more

3) It is common for car insurance companies to charge higher premiums for younger drivers. Younger drivers tend to earn less income than older drivers on avera

3) It is common for car insurance companies to charge higher premiums for younger drivers. Younger drivers tend to earn less income than older drivers on average. So why are younger drivers... more

Word problem

For the following data:   0.1   2.5.  2.6.  5.1   5.3.  6.7.  7.1 7.3.  7.5.  7.5.  8.9.  9.9.  10.1.  11.3 11.7.  12.5.  12.8.  14.1.  15.0.  17.5.  18.9 19.8.  21.7. 24.4.  24.9   a.... more

Calculate the sample standard deviation and sample variance for the following frequency distribution of final exam scores in a statistics class. If necessary, r

Final Exam ScoresClass Frequency51 - 60 661 - 70 1171 - 80 681 - 90 1191 - 100 4 Calculate the sample standard deviation and sample variance for the following frequency distribution of final exam... more

Assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find

Assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean muμ and standard deviation... more

finding the test statistic and P Value given a set of data

Listed below are the lead concentrations in mug/g measured in different traditional medicines. Use a 0.10 significance level to test the claim that the mean lead concentration for all such... more

stats questions

A random sample of 159 full-grown lobsters had a mean weight of 18 ounces; the standard deviation of weights of all lobsters is thought to be σ = 2.8 ounces.Use this data to construct a 98 percent... more

Simple random sample exercise using α= 5%

One company manufactures steel parts whose diameters follow a normal distribution with μ = 0.5 mm and σ^2 = 0.0784 mm^2. With the aim of increasing homogeneity in production, without modifying the... more

Percentages and probabilities

A retail shop accepts only cash or checks. Suppose that % of its customers carry cash, % carry checks, and % carry cash or checks (or both). What is the probability that a randomly chosen customer... more

statistics homework question

The mean weight of a sample of 201 pigs is 6.7 pounds with a population standard deviation of 1.6 pounds. Construct a 90% confident interval for the true mean of all pigs. Write a sentence... more

Homework Help really struggling

Question 6    Which of the following is NOT TRUE concerning the graphic depiction ("the curve") of a distribution for means?Question options: A) The curve is skewed to the right.  B) The area under... more

Probability of an event that is impossible

What is the probability of an event that is impossible? Suppose that a probability is approximated to be zero based on empirical results. Does this mean that the event is impossible?What is the... more

Is anyone willing to help I have submitted this twice and receive no feedback

A big-brand-name dishwasher, which costs $800.00, has a 20% chance of needing to be replaced in the first 2 years of purchase.  A two-year extended warranty costs $112.10 on a dishwasher.  What is... more

The Empirical Rule

The Empirical Rule indicates that we can expect to find what proportion of the sample included between ± 1 standard deviation?

formula difference

What differentiates the two formulasΣ (x – xbar)^2/n-1 from Σ (x – µ)^2/n,and why the difference?

Median price rather than the Mean

houses prices are usually reported as the Median price rather than the Mean (average) price. Why would this be true for a set of prices like: $120,000; $125,000; $110,000; $199,000; $100,000?

what is the probability in a given month

Assume that cases of mumps are random and independent and the number X of monthly mumps cases in Michigan has approximately the Poisson distribution with  = 0.2.  What is the probability that in a... more

Stat could someone please help with this urgent

What is an example of when you would want consistent data and, therefore, a small standard deviation?Example: Race-car DriverSmall Standard Deviation: Understanding RPM and when to change gearsThe... more

How to calculate percent from mean and standard deviation

The daily energy intakes of children follow a normal distribution with a mean of 1123 kcal and a standard deviation of 214 kcal. The recommended minimum daily intake is 1700 kcal. What percent of... more

If a club consists of 18 members how many different arrangements of president vice president and secretary are possible

If a club consists of 18 membees how many different arrangements of president,Vice President, and secretary are possible?
2 4 5 6 7 34

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