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9. A vendor is selling Coke and Sprite. He sold three times as many Cokes as Sprites. Ifhe sells 76 sodas in all, how many Cokes were sold? How many Sprites?
General
7 months ago
A shopper purchased 8 t shirts and 5 pairs of pants for 220. The next day he purchased 5 t shirts and 1 pair of pants. How much does a t shirt and each pair of pants cost
General
7 months ago
A recent poll asked people whether they supported passing a constitutional amendment to ban burning of the national flag using a 1 to 100 scale."1" means that they do not support passing the amendment at all and "100" means they support it completely. The sample was random (from the population of US adults) and included 986 people, 400 of whom were women, and 586 were men. The mean score for women was 80.6, while the mean score for men was 77.6. Is the difference in means test statistically significant at the 5% level? Assume the standard deviation for both men and women is 3.5.
General
7 months ago
Suppose a random sample of 1,220 adults in a certain country were asked about their opinion regarding federal spending on public education. Respondents were asked whether federal spending on public education was (a) too low, (b) adequate, or (c) too high. Respondents were classified by income level. Choose the correct hypotheses to test whether there is an association between the response to the question and income level.A. Upper H 0H0:Among adults in the country, opinions about federal spending on education and income level are associated.Upper H Subscript aHa:Among adults in the country, opinions about federal spending on education and income level are independent.B. Upper H 0H0:There is no difference between the proportions of adults in the country who responded (a), (b) or (c) to the opinion question.Upper H Subscript aHa:There is a difference between the proportions of adults in the country who responded (a), (b) or (c) to the opinion question.C. Upper H 0H0:Among adults in the country, opinions about federal spending on education and income level are independent.Upper H Subscript aHa:Among adults in the country, opinions about federal spending on education and income level are associated.D. None of these
General
7 months ago
the function y= x/tanx is ( an even, an odd, neither an even or odd) function, the function y= secx/x is (an even, an odd, neither an even or odd) function? I have to select one of the answers in parentheses.
General
7 months ago
The parking lot at a store has a width of 20 yards 2 feet and a length of 30 yards ______________________________I II II I 20 yards 2 feetI II II lI II_____________________________I 30 yards
General
7 months ago
Please assist me with these math problems asap. Round answers to the nearest tenth
General
7 months ago
Last Thursday, John assembled chairs at a rate of 3 chairs per hour for part of the day and Larry assembled no chairs. Last Friday, Larry assembled chairs at a rate of 4 chairs per hour for part of the day and John assembled no chairs. If John and Larry assembled chairs for a total of 7 hours during these two days, how many chairs did John assemble last Thursday?
General
7 months ago
The velocity-time graph for a two-stage rocket is shown below. Use the graph and your understanding and of slope calculations to determine the acceleration of the rocket during the following time interval.
General
7 months ago
A machine is shut down for repairs if a random sample of 100 items selected from the daily output of the machine reveals at least 15% defectives. (Assume that the daily output is a large number of items.) If on a given day the machine is producing only 10% defective items, what is the probability that it will be shut down? [Hint: Use the .5 continuity correction.]
General
7 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
7 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
7 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
7 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
7 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
7 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
7 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
7 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
7 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
7 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
7 months ago
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