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Build a 95% confidence interval for the difference in population menas, assuming that the population variances are equal. Please show work.
A simple random sample of 25 recent graduates from a particular college gives a sample mean starting salary of $24,000 with a sample standard deviation of $3,000. Build a 95% confidence interval for
A summary of the responses is shown in the table below. Can you conclude there is a relationship between marital status and alcoholic classifications? Test using=.05. Use traditional and p-value app
Conduct hypothesis test using\alpha¡=.05. Use traditional and p-value approach to hypothesis testing.
A statistics professor assigned various grades during the semester including a midterm exam (out of 100 points) and a logistic regression project (out of 30 points). The prediction equation below wa
X is a normally distributed random variable with mean 10 and varinace 24.
Suppose the first three crads are of the same denomination. What is the probability that this player will end up with either four of a kind or a full house (three crads of one denomination and two o
An urn contains nine white balls and 11 black balls. A ball is drawn and replaced. If the ball is white your opponent pays you 25 cents. If it is black you pay him 25 cents. You have one dollar and
John is a student in this class. What is the probability that at least one other student in the class has John's birthday (day and month, but not necessarily the year)?
Use the .05 significance level and the five-step hypothesis-testing process to check if the there is a difference in the mean flight times. Develop a 95% confidence interval for the difference in th
A bank branch wants to estimate the proportion of all customers who visit the bank primarily to use the outdoor ATM. In a random sample of 300 customers, 223 had come to the branch primarily to use
You are trying to estimate the number of CSN students with iPhones. A random sample of 130 students reveals that 65 of them have an iPhone. Estimate the percentage of all CSN students who have iPhon
In 2010, a Gallup poll surveyed 1016 households in the U.S about their pets. Of those surveyed, 599 said they had at least one dog or cat as a pet. Find and interpret the 95% confidence interval for
Use a normal curve to estimate the probability that the average age of the houses receiving the brochure is greater than 45 years.
The height of a building is measured 32 times. The average of the measurements is 206 feet, with standard deviation=1.8 feet. Find a 95% confidence interval for the true height of the building.
Find a 95% confidence interval for the average amount spent by all City College students on Black Friday. Find a 90% confidence interval for the percentage of all City College students who made at le
A company is criticized because only 17 of 48 executives at a local branch are women. the company explains that although this proportion is lower than it might wish, it's not a surprising value give
Discuss the various sampling methods we might use in determining which items to include in a sample?
What is the probability of getting no claims over $100 in a given day? What is the probability of getting at most two claims over $100 in a given day?
What is the Taguchi constant for a device that costs $400 to repair and a tolerance of plus or minus 0.5 mm with a mean squared deviation from the target of 0.3?
What are the basic assumptions underlying multiple means test, and why do they matter?
The national freshman-to-sophomore retention rate has held steady at 74%. A certain college has 499 of the 585 freshman return as sophomores. Does this college have a right to brag that it has an un
Build a 95% confidence interval for the mean starting salary of all graduates from this college.Interpret your result in words.
X is a normally distributed random variable with mean 10 and variance 24.