Find the expected count and the contribution to the chi-square statistic for the (Group 2, No) cell in the two-way table below. Yes No Total Group 1 Group 2 Group 3 67 23 90 59 131 Total 44 103 62 193 257 129 386
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- Fast computer: Two microprocessors are compared on a sample of 6 benchmark codes to determine whether there is a difference in speed the times (in seconds) used by each processor on each code are as follows: Code 3 4 Processor A 24.8 17.3 25.0 18.1 27.7 22.8 Processor B 27.8 16.3 22.3 26.5 25.4 26.6 Send data to Excel Part: 0 / 2 Part 1 of 2 (a) Find a 99.9% confidence interval for the difference between the mean speeds. Let d represent the speed of processor A minus the speed of processor B. Use tables to find the critical value. Carry your intermediate computations to at least 3 decimal places. Round your final answers to 2 decimal places. A 99.9% confidence interval for the difference between the mean speeds is <µ,< NOV 28 ... MacBook Ar F8 888 F6The table below gives the data on hand strength collected from college freshman using a grip meter. The preferred row gives the hand strength of each student's preferred hand while the nonpreferred column gives the hand strength of their nonpreferred hand. Preferred 52 49 47 45 20 30 52392521 Nonpreferred 49 42 44 43 22 29 49 32 2622 Preferred 27 26 28 54 32 45 28 403253 Nonpreferred 24 18 25 50 26 43 25 363047 (a) Use a calculator or computer to find the least squares regression line, y = mx + b, where the independent variable a denotes the grip strength of the preferred hand and the dependent variable y denotes the grip strength of the nonpreferred hand. Enter the equation for the line below. (Use at least four decimal places in any constants in your answer.) y = (b) What would the predicted grip strength in the nonpreferred hand be for a student with a preferred hand strength of 37 kg? strength = kg (round to nearest whole number) ← (c) For each of the preferred grip strengths…7. 40% of consumers believe that cash will be obsolete in the next 20 years based on a survey by J.P. Morgan Chase. Eight consumers are randomly selected and the number who believe cash will be obsolete is recorded. X 0 1 2 3 4 5 6 7 8 P(x) 0.017 0.090 0.209 0.124 0.041 0.008 0.001 Fill in the missing values from the table and identify each of the following characteristics used to construct the distribution: n= p= Discuss the three characteristics of the distribution. Shape: Center: Spread: Find the probability that exactly 4 people believe that cash will be obsolete. Find the probability that between 3 and 7 people believe that cash will be obsolete. Find the probability that at most 3 people believe that cash will be obsolete. x=
- An article included data from a survey of 2587 hiring managers and human resource professionals.The article noted that many employees are using social networks to screen job applicants and that this practice is becoming more common. Of the 2587 people who participated in the survey, 1300 indicated that they use social networking sites ( such as Facebook, MySpace, and LinkedIn) to research job applicants. For the purposes of this exercise, assume that the sample is representative of hiring managers and human resource professionals. d. suppose that researchers wanted to estimate the proportion of hiring managers and human resource professionals who screen job applicants using social networks. determine the sample size required to estimate the proportion of employers using social networks to screen job applicants to within .03 with 99% confidence. ( round your answer up to the nearest whole number ) hint: use formula that is used when the p estimate is unknownThe following table shows the Myers-Briggs personality preferences for a random sample of 400 people in the listed professions. Occupation Row Extroverted Introverted Total Clergy (all denominations) 65 42 107 M.D. 65 92 157 Lawyer 52 84 136 |Column Total |182 218 400The mass (g) of 8 randomly selected blue jay eggs are found as follows: 6.24, 5.31, 6.50, 5.57, 5.67, 5.15, 6.71, and 6.39. A field guide indicates that the mass of blue jay eggs generally is 6.1 g. Using R coding, choose an appropriate statistical test to determine whether these data support or refute that idea.
- A 2012 study of freely forming groups in bars all over Europe examined the natural behavior of groups. The researchers recorded the group size (number of individuals in the group) of all 501 groups in the study that were naturally laughing. The findings were displayed in the figure below. 300 Number of groups 250 200 O 52 O 2.7 0 2 150 3.5 4 100 50 0 254 2 Enter your answer here The median laughter group size in this study is 168 3 The mean laughter group size in this study is O 100.2 Enter your answer here 52 4 5 Laughter group size 21 6 6 Can we conclude from these findings that, in European bars in 2012, smaller groups were more likely than larger groups to be naturally laughing? Explain your statistical reasoning in one sentence.Road Grade. The grade of a road is defined as the distance it rises (or falls) to the distance it runs horizontally, usually expressed as a percentage. Consider a road with positive grade, g. Suppose that you begin driving on that road at an altitude a0. a. Find the linear equation that expresses the altitude, a, when you have driven a distance, d, along the road. (Hint: Draw a graph and apply the Pythagorean Theorem.) b. Identify and interpret the y-intercept and slope of the linear equation in part (a). c. Apply your results in parts (a) and (b) to a road with a 5% grade and an initial altitude of 1 mile. Express your answer for the slope to four decimal places. d. For the road in part (c), what altitude will you reach after driving 10 miles along the road? e. For the road in part (c), how far along the road must you drive to reach an altitude of 3 miles?A worm in my apple-Codling moths are a devastating insect pest for apples. Each spring, adult moths lay their eggs on or around developing appies. When the eggs hatch the larva, or wom, tunnels into the apple, where they feed on the fruit and develop for three to five weeks. Cain has developed a scanning machine to detect the presence of larvae in appies. If the apple is infested with larvae, the machine reports a positive result 84.3% of the time. If the apple is not infested, the machine reports a negative result 64.6% of the time Round all answers to 4 decimal places 1. Suppose that 8.2% of apples in an orchard are infested with larvae. Assume a theoretical population of 10,000 apples and construct the contingency table for this scenario Test Negative Infested Not infested Total Test Positive 2. What proportion of apples will test positive for larvae infestation? 3. What proportion of apples that test positive for larvae infestation would we expect to not actually be infested with…
- Use MS Excel plsAn experiment was conducted to study the effects of temperature and type of oven on the life of a particular component. Four types of ovens and 3 temperature levels were used in the experiment. Twenty-four pieces were assigned randomly, two to each combination of treatments, and the following results recorded. Oven Temperature (°F) O1 O2 O3 O4 500 227 221 214 225 260 259 236 229 550 187 181 232 246 208 179 198 273 600 174 198 178 206 202 194 213 219 Using a 0.01 level of significance, test the hypothesis that: different temperatures have no effect on the life of the component; а. b. different ovens have no effect on the life of the component; с. the type of oven and temperature do not interact.please complete the blank problem and or ones with a red x next to it not ones with a green check next to please