What is the mean of the curve in Figure (a)? What is the mean of the curve in Figure (b)?
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What is the mean of the curve in Figure (b)?
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- P(Z is between -1.20 and 1.15) = ✓ [Select] 0.7599 0.98257 0.1157 0.5833Harper's Index reported that 80% of all supermarket prices end in the digit 9 or 5. Suppose you check a random sample of 110 items in a supermarket and find that 83 have prices that end in 9 or 5. Does this indicate that fewer than 80% of the prices in the store end in the digits 9 or 5? Use ? = 0.05. I need help with sketching (d) and (e)a. What is the equation of the normal line to the curve 2x3+2y3-9xy=2 at the point (0,1)? b. Graph the function and the normal line.
- Stoaches are fictional creatures, sometimes mistaken for mome raths. Suppose a two-tailed t-test is conducted to test for a difference between the population means of adult female stoach weights and adult male stoach weights. The female sample has 13 weights, and the male sample has 7 weights. The t-statistic for the test is -0.20542. What is the p-value? (Give your answer to 4 decimal places.) p-value:Print A medical researcher says that less than 87% of adults in a certain country think that healthy children should be required to be vaccinated. In a random sample of 400 adults in that country, 85% think that healthy children should be required to be vaccinated. At a = 0.01, is there enough evidence to support the resear claim? Complete parts (a) through (e) below. 4 (a) Identify the claim and state H, and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) O A. Less than % of adults in the country think that healthy children should be required to be vaccinated. O B. More than % of adults in the country think that healthy children should be required to be vaccinated. OC. % of adults in the country think that healthy children should be required to be vaccinated. O D. The percentage of adults in the country who think that healthy children should be required to be…6. A researcher hypothesizes that people who are allowed to sleep for only four hours will score significantly lower than people who are allowed to sleep for eight hours on a cognitive skills test. He brings sixteen participants into his sleep lab and randomly assigns them to one of two groups. In one group he has participants sleep for eight hours and in the other group he has them sleep for four. The next morning he administers the CAT ( Cognitive Ability Test) to all participants. (Scores on the CAT range from 1-9 with high
- An excerpt of the t table with 57 degrees of freedom is given below. Degreesof Freedom Area in Upper Tail 0.20 0.10 0.05 0.025 0.01 0.005 57 0.848 1.297 1.672 2.002 2.394 2.665 The t table gives the area in the upper tail of the curve, so only positive values of t are given. However, this curve is symmetric about 0 so the area in the upper tail is the same as the area in the lower tail for a given number of degrees of freedom. That is, for 57 degrees of freedom, the area in the lower tail, left of t = −1.190, will be the same as the area in the upper tail, right of t = 1.190. We will first determine a range of the p-value corresponding to the upper tail. The columns represent the area in the upper tail of the curve and the rows represent the degrees of freedom. The values within the table are values of t. Moving along the row for 57 degrees of freedom, note that the exact value of the test statistic, t = 1.190, is not in this row. However, it is directly between the values of…The following graph is a standard curve based on the concentrations (in ppm) of the standards produced and the value of the instrument response (absorbance in this case) 1.200 1.000 O800 0.600 O400 0.200 0.000 0.0 2.0 4.0 6.0 8.0 Concentration (ppm) You have a sample with an unknown concentration. Your sample gives an instrument response of 0.8. What is the (approximate) concentration of your sample (in ppm)? AbsorbanceS The chair of the business department hypothesizes that the final grades in a statistics course are distributed as 30% A's, 40% B's, 20% C's, and 10% D or F's. At the end of the semester, the following numbers of grades were earned in a class with 50 students. B C D, F 21 11 4 Grade A Number 14 Calculate the chi-square value.