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MATH SOLVE
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Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of the two herbicides. In a field containing 10 seedlings, five were randomly selected throughout the field and assigned to receive Herbicide A. The remainder was to receive Herbicide B. Soil and weeds for each seedling were treated with the appropriate herbicide, and, at the end of the study period, the height (cm) was recorded for each seedling. The following results were obtained: Herbicide A 87, 80, 80, 76, 73 Herbicide B 78, 77, 74, 68, 62 A 90% confidence interval for the difference in mean heights for the two herbicides is (0.2, 14.6). Which of the following statements is correct? The P-value for a test of the null hypothesis of equal means and the alternative of different means would be greater than 10% because the interval doesn't include 0. Neither of those statements is correct. A 95% confidence interval could not include 0, because we would be even more confident of a difference in the groups.
General
4 months ago
The amount of money that high school students spend on fast food each month is usually between $50 and $200. However, there are a few students who do not eat fast food at all. What measure of spread would be most appropriate to measure the amount of money that high school students spend on fast food per month?
General
4 months ago
Check all of the functions that are odd.f(x)=x3-x2f(x)=x5-3x3+2xf(x) = 4x + 9
General
4 months ago
What is the mean absolute deviation (MAD) of the data set?
General
4 months ago
Find the matrix a of the linear transformation t from ℝ2 to ℝ2 that rotates any vector through an angle of 150∘ in the clockwise direction.
General
4 months ago
Use the drop-down menus to complete each equation so the statement about its solution is true. 7 + 2x = 2(x - 1) + 4
General
4 months ago
Does anyone know how to do this. Please show your work
General
4 months ago
I’m another normally distributed test score is 80 and the standard deviations is 10. How common are values in the less than 60? Show your work
General
4 months ago
The rectangle below has an area of 12x^4+6x^3+15x^212x 4 +6x 3 +15x 2 12, x, start superscript, 4, end superscript, plus, 6, x, start superscript, 3, end superscript, plus, 15, x, start superscript, 2, end superscript square meters. The width of the rectangle (in meters) is equal to the greatest common monomial factor of 12x^4, 6x^3,12x 4 ,6x 3 ,12, x, start superscript, 4, end superscript, comma, 6, x, start superscript, 3, end superscript, comma and 15x^215x 2 15, x, start superscript, 2, end superscript. What is the length and width of the rectangle?
General
4 months ago
write a linear equation in point slope form the line that goes through (-1,1) and (1,-5).
General
4 months ago
What is the probability of obtaining twotwo headsheads in a row when flipping a coin? Interpret this probability.
General
4 months ago
Use the method of cylindrical shells to find the volume V of the solid obtained by rotating the region bounded by the given curves about the x-axis. x + y = 7, x = 16 − (y − 3)2
General
4 months ago
Solve x2 + 6x = 9 for x by completing the square.a. x = −6b. x = 0 c. x equals plus or minus square root of 18 minus 3d. x = x equals plus or minus square root of 18 plus 3
General
4 months ago
22. Abnormalities In the 1980s, it was generally believed that congenital abnormalities affected about 5% of the nation’s children. Some people believe that the increase in the number of chemicals in the environment has led to an increase in the incidence of abnormalities. A recent study examined 384 children and found that 46 of them showed signs of an abnormality. Is this strong evidence that the risk has increased? a) Write appropriate hypotheses. b) Check the necessary assumptions and conditions. c) Perform the mechanics of the test. What is the P-value? d) Explain carefully what the P-value means in context. e) What’s your conclusion? f) Do environmental chemicals cause congenital abnormalities? 23. Absentees The National Center
General
4 months ago
A pharmaceutical company receives large shipments of aspirin tablets. The acceptance sampling plan is to randomly select and test 36 tablets, then accept the whole batch if there is only one or none that doesn't meet the required specifications. If one shipment of 5000 aspirin tablets actually has a 2% rate of defects, what is the probability that this whole shipment will be accepted? Will almost all such shipments be accepted, or will many be rejected?
General
4 months ago
In the game of roulette, a player can place a $4 bet on the number 29 and have a 1/38 probability of winning. If the metal ball lands on 29, the player gets to keep the $4 paid to play the game and the player is awarded an additional $140. Otherwise, the player is awarded nothing and the casino takes the player's $4. What is the expected value of the game to the player? If you played the game 1000 times, how much would you expect to lose?
General
4 months ago
The overall distance traveled by a golf ball is tested by hitting the ball with Iron Byron, a mechanical golfer with a swing that is said to emulate the legendary champion, Byron Nelson. Ten randomly selected balls of two brands are tested and the overall distance measured. Assume that the variances are equal. The data follow: Brand 1: 277 278 287 271 283 271 279 275 263 267 Brand 2: 262 248 260 265 273 281 271 270 263 268 Is there evidence to show that there is a difference in the mean overall distance of brands?
General
4 months ago
A research study was conducted about gender differences in "sexting." The researcher believed that the proportion of girls involved in "sexting" is less than the proportion of boys involved. The data collected in the spring of 2010 among a random sample of middle and high school students in a large school district in the southern United States is out of 2231 males, 183 participated in texting. Out of 2169, 156 participated. Is the proportion of girls sending sexts less than the proportion of boys "sexting
General
4 months ago
A group of students estimated the length of one minute without reference to a watch or clock, and the times (seconds) are listed below. Use a 0.05 significance level to test the claim that these times are from a population with a mean equal to 60 seconds. Does it appear that students are reasonably good at estimating one minute? 70 79 38 63 44 23 62 61 67 50 61 70 94 87 65
General
4 months ago
How many ways can four numbers be drawn from a group of ten numbers if the order does not matter?
General
4 months ago
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