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A normal population has a mean of 20. after an experimental treatment, a sample yields the following scores: 15,25,30,20 and 22. What is the t-score for a hypothesis test for the effect of the treat
A manufacturer of automobile purchases machine bolts from a supplier who claims that no more than 5% of suppliers bolts are defective. From a sample of 400 bolts, it is found that 28 are defective.
An equiprobable approach goodness of fit test with 9 cells for sample data that is normally distributed with a mean of 10 and a std of 2, would have how many degrees of freedom for the critical valu
Let W1 and W2 be independent geometric random variables with parameters 0.2 and 0.4. Find
Estimate the average life expectancy in the United States in the year 1956 according to the linear model in part (a). Average life expectancy in 1956?
Additionally, a random sample of 1000 registered voters in the southern half of the state is selected, of which 475 support the candidate. Reference: Ref 20-1 The estimate for the proportion of regi
If you collect data at any ONE restaurant, the correlation between the amount of food served per person and the price paid for it should be:
A confidential and voluntary survey conducted in STA 3024 in the Spring of 1999 asked the students questions about their sex life. A simple linear regression analysis was conducted to predict the nu
Find the equation of the Least Squares Regression line if:
A survey of Statistics undergraduate at Prosperity University completed a survey that asked for their Verbal and Math SAT scores. They wanted to predict the verbal score based on the math score. The
If you collect data at SEVERAL restaurants, mixing both the expensive "gourmet" type and the cheap cafeteria type, the correlation between the amount of food served per person and the price paid for
From 1975 to 1986, the General Social Survey asked its participants if they favored or opposed capital punishment. A least squares regression line was calculated to predict the percent that favored
Someone is interested in studying property tax rates in the United States. He randomly selects 25 homes and looks up their property tax rate. He is interested in studying the center, shape and sprea
A study of cats and dogs found that 25 of 45 cats and 44 of 60 dogs slept more than 10 hours per day. At the .05 level of significance, is there sufficient evidence to conclude that a difference exi
Express F as a function of three random variables: G, Z, and B~Bin(1,1/2), where all 3 are mutually independent. Compute the expected value of F.
The Coca-Cola Company reported that the mean per capita annual sales of its beverages in the United States was 423 eight-ounce servings (Coca-Cola Company website, February 3, 2009).
A random sample of size 16 is chosen from a population & has 90% confidence interval for the standard deviation will be determined. What amount of the data is located in each tail?
Also conduct a test of hypothesis at the 5% significance level. Does the statistical evidence support the manufacturer's claim? And what is the p value?
Use this sample information to develop a 99% confidence interval for the population proportion of women who wear flats to work.
Calculate an estimate for the true avg IAT under the described AN protocol; do so in a way that conveys info about the reliability and precision of the estimation.
Each person in a random sample of 225 male teenagers and a random sample of 306 female teenagers was asked how many hours he or she spent online in a typical week. The sample mean and standard devia
An inspector inspects large truckloads of potatoes to determine the proportion in the shipment with major defects prior to using the potatoes to make potato chips.
These are call cumulative percentages. Between what two heights is the median of the heights of young men ages 24-34? Explain.