if the scores of samples of students are 11 12 10 11 16 11 15 (a)15 (b)11 (c)10 then mode is :
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- Here are 3 boxplots of weekly gas prices at a service station in the United States (price in $ per gallon). Compare the distribution of prices over the three years. Choose the best answer below: A. Gas price have been increasing on average over the 3-year period, but the spread has been decreasing. The distribution has been skewed to the left, and there were 3 high outliers in 2005. B. Gas price have been increasing on average over the 3-year period, and the spread has been increasing as well. The distribution has been skewed to the left, and there were 3 high outliers in 2005. C. Gas price have been increasing on average over the 3-year period, and the spread has been increasing as well. The distribution has been skewed to the right, and there were 3 high outliers in 2005. D. Gas price have been decreasing on average over the 3-year period, and the spread has been decreasing. The distribution has been skewed to the left, and there were 3 high outliers in 2005. E. Gas…In general,_____% of the values in a data set lie at or below the 94th percential. _______% of the values in a data set lie at or above the 90th percentile... if a sample consists of 800 test scores,___ of them would be at or below 40th percential, if a sample consists of 800 test scores,____ of then would be at or above the 58th percentile.If two variables are related so that increasing values of one variable are associated with decreasing values of other, then there is a what relationship between the varialves?
- A student wondered what proportion of a large jar of thousands of marbles were red and speculated that it was 0.30. She took a random sample of 50 marbles and got 18 red marbles, for a sample proportion of 0.36. Below is a dotplot of 100 simulated samples of drawing 50 marbles from a population that is set up to have the proportion of "red marbles" to be 0.30. Based on this dotplot, would getting a sample of 50 marbles to have a 0.36 proportion of red marbles be significant evidence that the true proportion of red marbles in the whole jar is greater than 0.30?An educational software company wants to compare the effectiveness of its computer animation for teaching biology with that of a textbook presentation. The company gives a biology pretest to each of a group of high school juniors, and then divides them into two groups. One group uses the animation, and the other studies the test. The company retests all students and compares the increase in biology test scores in the two groups b. If the group using the computer animation has a much higher average increase in test scores than the group using the textbook, what conclusions, if any, could the company drawIn general, ___________% of the values in a data set lie at or below the 28 th percentile. _______________ % of the values in a data set lie at or above the 90 th percentile.. If a sample consists of 700 test scores, _________of them would be at or below the 52 th percentile. If a sample consists of 700 test scores, ________ of them would be at or above the 64 th percentile.
- A researcher is surprised at the low Pearson Product Moment correlation coefficient between the heights and weights of the members of the woman’s basketball team at his college. He should have realized a. that he had several outliers and that reduced the correlation b. the range of heights was restricted and that reduced the correlation c. the relationship was curvilinear and could not be detected by the Pearson Product Moment correlation d. Height does not cause weightAn auctioneer of antique Iranian rugs kept records of his weekly auctions in order to determine the relationships among price, age of carpet or rug, number of people attending the auction, and the number of times the winning bidder had previously attended his auctions. He felt that, with this information, he could plan his auctions better, serve his steady customers better, and make a higher overall profit for himself. The results shown in the accompanying table were obtained.The researcher found that the model’s effect size was very large where R = .957. Furthermore, R2 = .917. How much of the variance can be explained by the linear combination of predictor variables?
- . Suppose X ~ N(2,3). What value of x has a z-score of -0.67?a pollster wnats to minimize the effect the order of the questions has on a person's response to a survey. how many different surveys are required to cover all possible arrangements if there are 9 questions on the survey?(a) In each Australian capital city, a large retail chain has several stores, including in Brisbane and Perth. An analysis of the variations in profits from each of these cities indicates that the variance of monthly profits in Brisbane is about 2570(k$)^2 and the variance of monthly profits in Perth is about 1789(k$)^2 . A comparison of the difference in profits between the two cities indicates that the variance of the monthly difference in profits between these cities is about 1253(k$)^2 . (i) Calculate the covariance between the two cities' monthly profits using this information. (ii) Find the correlation (ρ) between the monthly profits in these two cities. (b) Quality control staff wish to estimate what proportion p of the resistors made in their factory are scrapped due to defects. Based on a random sample of n = 750 resistors from the production line, they calculate the scrapped resistor proportion to be ˆp = 0.016. Use this information to determine an approximate range a. This…
