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Statistics-And-Probability Questions
Statistics-And-Probability Questions
1. Which of the following tests would you use to explore the relationship between two ordinal...
In psychology, there is a particular Mental Development Index (MDI) used in the study of infants....
A study found that consumers spend an average of $22 per week in cash without being...
3. The packaging process in a breakfast cereal company has been adjusted so that an average...
When to Use What: For each example below you would start to construct a confidence interval...
Conduct a test at the a = 0.10 level of significance by determining (a) the null...
I can have achieve a higher level of certainty in a statistical test analysis (such as...
A news article reports that "Americans have differing views on two potentially inconvenient and invasive practices...
Consider the following statements concerning Student's t distribution: A. The variance of the t distribution decreases...
Are Japanese managers more motivated than American managers? A randomly selected group of each were administered...
Suppose the null hypothesis is not rejected. State the conclusion based on the results of the...
Specifications for the computer upgrades are 76 minutes and 81 minutes. Estimate the percentage of process...
By differentiating both sides of ∫N(x|µ, σ² ) dx = 1 (the integral from −∞ to...
11. The 2003 Statistical Abstract of the United States reported the percentage of people 18 years...
5 cards are dealt from a standard 52 card deck. What is the probability that the...
1. You measure 42 textbooks' weights, and find they have a mean weight of 47 ounces....
Using the “Rule of Thumb” guideline flow chart, what would be the best choice for a...
Researchers were interested in whether there was a difference in physical activity (measured by average steps...
Suppose that the time required to complete a 1040R tax form is normally distributed with a...
A study of the ages of motorcyclists killed in crashes involves the random selection of 153...
1. Suppose the exam scores are normally distributed with a population mean of 77.2% and a...
150 subjects in a psychological study had a mean score of 36 on a test instrument...
In a company with 30 employees, it was found that 10 people work in administration, 8...
Let I have the Bernoulli (p) distribution. Think of Var(I) as a function of p ∈...
If two variables are each correlated significantly with the dependent variable, then the multiple correlation will...
The Arc Electronic Company had an income of 9090 million dollars last year. Suppose the mean...
Listed below is the annual rate of return (reported in percent) for a sample of 12...
(The setup for this question may be repeated on other questions.) The long-term performance of a...
Suppose 6 cards are dealt from an ordinary deck of 52 playing cards. (a) What is...
3 people with varying age-related mortality rates for a disease. 02%, .04% and .04% respectively. What...
Find standard deviation of the following numbers using the computational formula. 2, 1, 11, 15, 15,...
A randomly selected sample of college basketball players has the following heights in inches. 66, 65,...
1. Given the probability distribution shown for an infinite population with the discrete random variable, x:...
1) Workers at a large toxic cleanup project are concerned that their white blood cell counts...
The Pepsi Corporation wants to explore the relationship between the daily temperature in California and the...
Solar energy is considered by many to be the energy of the future. A recent survey...
A simple random sample of size N = 12 is drawn from a population that is...
Let X1,...,Xn,... ∼ iid Poisson(θ). We wish to estimate the quantity g(θ) = (θ − 1)2....
The Manx allele is an autosomal dominant mutation that is lethal when homozygous. If 4 kittens...
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In an analysis of variance (ANOVA), subtracting the grand mean from each person’s score provides a...
1. Which scenario would give us a normal distribution? A. Almost everyone in class gets an...
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the...
A company that owns department stores advertised for one month on television and radio and in...
Suppose that we want to find a regression equation relating systolic blood pressure (y) to weight...
An inspector has a 99%chance of correctly identifying defective items and a 0.5% chance of incorrectly...
Scores of high school seniors taking the English Regents examination in New York State are normally...
You roll a die. If it comes up a 2 or 3, you win $300 If...
Use the factor theorem and synthetic division to decide whether the second polynomial is a factor...
A bag contains numbered balls 1, 2 and 3. Two balls are sampled without replacement. Let...
1,000 men with no prior evidence of prostate cancer were enrolled in a study. The men...
Suppose a friend of yours thinks that Coke, Diet Coke, and Coke Zero all have the...
An association was formed by students to protest labor exploitation in the apparel industry. There were...
In a survey funded by the University of Washington School of Medicine, 195 of 1,300 adult...
x P(x) 0 0.1 1 0.2 2 0.15 3 0.55 Find the standard deviation of this...
In a survey funded by the University of Washington School of Medicine, 420 of 1,500 adult...
Suppose that Stephen is the quality control supervisor for a food distribution company. A shipment containing...
In researching how people choose a store to enter as they walk through a shopping mall,...
A general contracting firm experiences cost overruns on 16% of its contracts. In a company audit,...
For each of the following problem, you must: a) Define the population and the parameter of...
Majesty Video Production Inc. wants the mean length of its advertisements to be 30 seconds. Assume...
1. A radioactive chemical has a decay rate of approximately 10% per year. Suppose that this...
Assume that when adults with smartphones are randomly selected, 38% use them in meetings or classes....
A 95% confidence interval is equivalent to which of the following hypothesis tests? Choose the correct...
The number in row 31, column 3 is:Answer The sum of the GPA's in rows 10...
The weight of an almond varies with mean 0.049 ounce and standard deviation 0.014 ounce. a....
A company claims that nine out of 10 doctors recommend it’s brand of cough syrup to...
Is the following a discrete probability distribution x P(x) 92 0.14 30 0.14 70 0.30 10...
The mean height of 36 randomly selected NYC College students is 68.2 inches, with a standard...
A small regional carrier accepted 14 reservations for a particular flight with 10 seats. 5 reservations...
A psychology experiment measures the reaction times of sleep-deprived volunteers, yielding a total of 530 observed...
To determine whether or not they have a certain disease, 80 people are to have their...
Two random samples are taken, one from among UVA students and the other from among UNC...
How many ways can four red balls and four blue balls be randomly placed in eight...
Your hypothesis test for a proportion has a left-tailed critical region. The test statistic is z...
Suppose we have two coins, coin A and coin B, and flip them each 10 times....
The P-value for the t* statistic defined in the previous problem is between what 2 values?...
Lightbulbs of a certain type are advertised as having an average lifetime of 750 hours. The...
In an election, 53% of voters are expected to vote for candidate A. Consider a sample...
A food safety guideline is that the mercury in fish should be below 1 part per...
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