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In an examination of holiday spending (known to be normally distributed) of a sample of 16 holiday shoppers at a local mall, an average of $54 was spent per hour of shopping. Based on the current sa
Durations of clinical research studies awarded by a particular federal agency are assumed to follow a normal distribution, with a mean of 24 months and a standard deviation of 2.5 months.
What is the estimated regression equation? Perform a t test and determine whether or not x and y are related. Use α = 0.05.
A basketball coach wants to know how many free throws an NBA player shoots during the course of an average practice. The coach takes a random sample of 43 players and finds the average number of fre
A newspaper reports that the governor's approval rating stands at 69%. The article adds that the poll is based on a random sample of 726 adults and has a margin of error of 4%. What level of confide
Using MINITAB test the hypothesis that the voting patterns are similar across year in school. Use a=0.05. Identify the parameters
Construct the contingency table. Does this data suffest the side ffects of the drug and gender related? Use a=0.05
It is believed that 4% of children have a gene linked to juvenile diabetes. Researchers would like to test new monitoring equipment for diabetes. They hoped to have at least 20 children for their st
Should you use a binomial distribution? Please give a reason for your answer. In a random sample of students X is the number of hours a person studies.
Suppose that 6% of the apples on the truck don't meet the desired standard. What is the approximately probability that the shipment will be accepted anyway?
It has been stated that 75% of the population have a smart phone. If you randomly choose 10 people, what is the probability that at least 9 people will say they have a smart phone? Please show your
A shipment of assorted nuts is labeled as 45% walnuts, 20% hazelnuts, 20% almonds, and 15% pistachios by count. A random scoop of mixture had following counts.
Find and interpret the mean of the random varibale. Obtain the standard deviation of the random variable.
In a test of weld strength, 80% of tests result in a fracture in the weld,while 20% result in fracture in the beam. Let X denotes the number of failed trials that precede the 3rd beam fracture.
Let Y bethe num. of gallons ordered. Find the probability mass function of Y. Find the mean and varianceof the number of gallons ordered.
Just before a city referendum on a school budget, a local newspaper polls 372 voters in an attempt to predict whether the budget will pass. Suppose the budget has a support of 54% of the voters. Wha
Create a 95% confidence interval for this percentage? If the companuy wants to cut the margin of error in half, how many users they must survey?
The frequencies of different blood types of 200 people who volunteered at a plasma center is given in the table.
Why would we use a matched-pairs design and what is an example where this would apply?
How does the t-value for the sample correlation coefficient r compare to the t-value for the corresponding slope b of the sample least-squares line?
A small company involved in e-commerce is intersted in statistics concerning the use of e-mail. A poll found that 39% of a random sample of 1079 adults, who use a computer at their home, work, or sc
Two cards are drawn at random from an ordinary deck of 52 cards. Determine the probability that both cards are hearts if
The value of the chi-square statistic for testing the null hypothesis that the proportion of Internet users is the same, regardless of the type of community they lived in, is 55.363. The P-value for
Shown below is a portion of a computer output for a regression analysis relating y (dependent variable) and x (independent variable).