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Use the given information to find the number of degrees of freedom, the critical values chi Subscript Upper L Superscript 2 and chi Subscript Upper R Superscript 2, and the confidence interval estimate of sigma. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 98% confidence; nequals28, sequals0.22 mg.
General
8 months ago
Nola purchased 2.5 pounds of cheese for $10.50. Her mother purchased 3 pounds of the same cheese for $12.60. The cost of cheese varies directly with the number of pounds purchased. How much does one pound of cheese cost?
General
8 months ago
Determine the general form of the equation for the circle (x – 1)2 + (y + 2)2 = 3.x2 + y2 – 2x + 4y + 2 = 0x2 + y2 – 2x + 4y – 4 = 0x2 + y2 – x + y + 3 = 0x2 + y2 – x + y + 2 = 0
General
8 months ago
A backhoe can dig 5/10 of a ton of dirt in 1/6 of a hour. Compute the unit rate by setting up a complex fraction and simplifying.
General
8 months ago
Kevin has 16 ounce can of mixed nuts he gives 1/2 of the mixed nuts to his sister. He then eats 3/4 of the remaining nuts. How many ounces of mixed nuts are left in the can?
General
8 months ago
bright pools is building a rectangular pool at a new house. The perimeter of the pool has to be 94 feet and the length has to be 2 feet more than twice the width. What will be the length and width of the pool?
General
8 months ago
Multiply. 3√⋅22√⋅58√⋅18−−√Enter your answer in simplest radical form.Please HELP!
General
8 months ago
For a production of sweeney todd in las vegas, orchestra seats cost $42 and mezzanine seats cost $25. if a group of 14 people show up and spend a total of $486, how many of each kind of seat did they buy? please help, please show work!
General
8 months ago
What are the coordinates of point C below segment AC that is partitioned at point B in a ratio of 2 to 5.
General
8 months ago
Twenty percent of U.S. mortgages are "underwater" (The Boston Globe, March 5, 2009). A mortgage is considered underwater if the value of the home is less than what is owed on the mortgage. Suppose 100 mortgage holders are randomly selected. a. What is the probability that exactly 15 of the mortgages are underwater? (Round your answer to 4 decimal places.)
General
8 months ago
The tobacco industry closely monitors all surveys that involve smoking. One survey showed that among 785 randomly selected subjects who completed 4 years of college, 18.3 % smoke. The 99% confidence interval for the true percentage of smokers of all people who completed 4 years of college is closest to
General
8 months ago
Jamal is going to borrow $25,000 from his credit union to buy a used car. The APR is 7% and the length of the loan is 5 years. What will his monthly payments be? How much is his financial charge?
General
8 months ago
THERE ARE 165 CHILDREN TAKING SWIMMING LESSONS AT THE POOL IF 10 CHILDREN WILL BE ASSIGNED TO EACH INSTRUCTORS NEED TO BE HIRED?
General
8 months ago
Christine collected some toys for a charity. She donated 3/4 of the toys to charity A. Then she donated 1/3 of the remaining toys to charity B. After the two donations, Christine had 10 toys left. How many toys did Christine originally collect?
General
8 months ago
A store pays $20 for a hat. to make a profit the store prices the hat 60% higher. later a sale reduce the price by 10%. finally, a clearance sale reduces the sale price by 40%. what is the clearance price?
General
8 months ago
A December 2009 poll asked a random sample of people whether they thought their country was heading in the right direction. Each respondent answered "Right Direction" or "Wrong Direction" and was classified as Republican, Democrat, or Independent. If we were interested in testing whether party affiliation was associated with the answer to the question, would this be a test of homogeneity or of independence? Explain.
General
8 months ago
A square is inscribed in a circle such that each corner touches the circle. A. Find a function that gives the area of the square as a function of the radius of the circle. Simplify the function as much as possible, and describe any symmetry in the function. Make certain to show all the steps you use to come up with the function, as well as describe your reasoning B. State the domain and range of the function you came up with in part (A), keeping in mind all practical considerations.
General
8 months ago
A development economist is studying income growth in a rural area of a developing country. The last census of the population of this area, several years earlier, showed that mean household annual income was 425 dollars, and the variance of household income was 2500 (dollars-squared). A current random sample of 100 households yields a sample mean income of $433.75. Assume that household annual incomes are approximately normally distributed, and that the population variance is known still to be 2500. Test the null hypothesis that population mean income has not increased against the alternative hypothesis that it has increased, at a 1% level of significance. What is the form of the rejection region that should be used to conduct this hypothesis test?
General
8 months ago
An experimenter would like to construct a 99% two-sided t-interval, with a length at almost 0.2 ohms, for the average resistance of a segment of copper cable of a certain length. If the experimenter feels that the standard deviation of such resistances is no larger than 0.15 ohms, what sample size would you recommend? Assume that an appropriate t-value is 3.0.A. Aprox 10B. Aprox 20C. Aprox 30D. Aprox 40E. Aprox 50
General
8 months ago
In a survey of 474 U.S. women, 365 said that the media has a negative effect on women's health because they set unattainable standards for appearance. Let p denote the proportion of all women who think media has a negative impact on women's health because they set unattainable standards for appearance. Find a point estimate for p and also construct a 95% confidence interval for p. .a. 7700, (.7321, .8079)b .2300, (.1921, -2679)c. 365, (.7683, .7717)d. 365, (.7507, .7893)e .7700, (.7507, .7893).
General
8 months ago
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