Do these data show sufficient evidence to reject the claim that the choice of college major is independent of hand posture? let alpha =0.05
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In a psychology experiment, 140 students were divided into majors em-
phasizing left-hemisphere (LH) brain skills (e.g. philosophy, physics, and
mathematics) and majors emphasizing right-hemisphere (RH) skills (e.g. art,
music, theater, and dance). They were also classified into one of three groups
on the basis of hand posture (right noninverted (RN), left inverted (LI), and
left noninverted (LN)). The data are as follows:
LH RH
RN 89 29
LI 5 4
LN 5 8
Do these data show sufficient evidence to reject the claim that the choice of college major is independent of hand posture? let alpha =0.05
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- In a study of the Gouldian finch, Griffith et al. (2011) looked at stress caused by having an incompatible mate. There are two genetically distinct types of Gouldian finches, one having a red face and the other having a black face. Previous experiments have shown that female finches have a strong preference for mating with males with the same face color as themselves and that when different face types of finch mate with one another, their offspring are less likely to survive than when both parents are the same type. Researchers paired females sequentially with males of both types in random order.In other words, each female bred twice once with a compatible male and once with an incompatible male. Each time, females produced a brood of young with the assigned male. For each pairing, the researchers measured the blood corticosterone concentration (in units of ng/ml) as an index of the amount of stress the females experienced. The corticosterone data for 43 females are given below:…In a study of the domestic market share of the three major automobile manufacturers A, B, and C in a certain country, it was found that their current market shares were 65%, 10%, and 25%, respectively. Furthermore, it was found that of the customers who bought a car manufactured by A, 75% would again buy a car manufactured by A, 15% would buy a car manufactured by B, and 10% would buy a car manufactured by C. Of the customers who bought a car manufactured by B, 90% would again buy a car manufactured by B, whereas 5% each would buy cars manufactured by A and C. Finally, of the customers who bought a car manufactured by C, 85% would again buy a car manufactured by C, 5% would buy a car manufactured by A, and 10% would buy a car manufactured by B. Assuming that these sentiments reflect the buying habits of customers in the future, determine the market share that will be held by each manufacturer after the next two model years. (Round your answers to the nearest percent.)A study in Sweden looked at former elite soccer players, people who had played soccer but not at the elite level, and people of the same age who did not play soccer. Here is a two-way table that classifies these subjects by whether or not they had arthritis of the hip or knee by their mid-fifties: Elite Non-elite Did not play Arthritis 10 9 24 No arthritis 61 206 548 Based on this study, you can conclude that
- In an online psychology experiment sponsored by the University of Mississippi, researchers asked study participants to respond to various stimuli. Participants were randomly assigned to one of three treatment groups: Group 1, the simple group, required to respond as quickly as possible after a stimulus was presented; Group 2, the go/no-go group, required to respond to a particular stimulus while disregarding other stimuli; and Group 3, the choice group, required to respond differently depending on the stimuli presented. The researcher felt that age may be a factor in determining reaction time, so she organized the experimental units by age into an 18-24 year old group (1), a 25-34 year old group (2), and a 35 and older group (3). She obtained the data given in the “Psychology data” JMP file. a)How many treatments are there? b)What type of factorial design is this? How many replications are there within each cell?In a study of the domestic market share of the three major automobile manufacturers A, B, and C in a certain country, it was found that their current market shares were 45%, 20%, and 35%, respectively. Furthermore, it was found that of the customers who bought a car manufactured by A, 75% would again buy a car manufactured by A, 15% would buy a car manufactured by B, and 10% would buy a car manufactured by C. Of the customers who bought a car manufactured by B, 90% would again buy a car manufactured by B, whereas 5% each would buy cars manufactured by A and C. Finally, of the customers who bought a car manufactured by C, 85% would again buy a car manufactured by C, 5% would buy a car manufactured by A, and 10% would buy a car manufactured by B. Assuming that these sentiments reflect the buying habits of customers in the future, determine the market share that will be held by each manufacturer after the next two model years. (Round your answers to the nearest percent.) A % B…A study collected arm bone strength information for two groups of young men. The first group in the study was a control group of 15 men who are not baseball players. The table below gives the bone strengths of the dominant and the nondominant arms for those 15 men. ID Nondominant Dominant ID Nondominant Dominant 1 15.6 16.4 9 15.8 20.1 2 25.2 26.8 10 13.8 18.7 3 17.8 18.7 11 17.6 18.7 4 19.1 22.0 12 15.4 15.2 5 12.0 14.8 13 14.3 16.2 6 20.0 19.9 14 14.2 15.0 7 12.3 13.2 15 12.3 12.8 8 14.3 17.4 The least-squares regression line for these data is dominant = 2.75 + (0.937 ✕ nondominant) The second group in the study comprised men who played baseball. We know that these baseball players use their dominant arm in throwing (those who throw with their nondominant arm were excluded), so they get more arm exercise than the controls. Here are the data for the baseball players. ID Nondominant Dominant ID Nondominant Dominant 16 17.0 19.2 24 15.2 19.4 17 16.8…
- In soccer team “M,” there are two playmakers: Player A, and Player B, and two goal scorers: Player X and Player Y. Based on extensive data collection of 100 goals that were scored in the last two seasons by this team: player A created 60 of the goals, while player B created the remaining 40. Among the plays that were created by player A, 38 goals were scored by player X, and the remaining 22 goals were scored by Player Y. Among the plays that were created by Player B, 15 goals were scored by Player X, while the remaining 25 goals were scored by player Y. In a new match, you heard that Player X scored a goal, what is the probability that this goal was created by Player A?In 1975, the automobile industry determined that 40% of American car owners drove large cars, 20% drove intermediate-sized cars, and 40% drove small cars. A second survey in 1985 showed that 70% of the largecar owners in 1975 still owned large cars in 1985, but 30% had changed to an intermediate-sized car. Of those who owned intermediate-sized cars in 1975, 10% had switched to large cars, 70% continued to drive intermediate-sized cars, and 20% had changed to small cars in 1985. Finally, of the small-car owners in 1975, 10% owned intermediate-sized cars and 90% owned small cars in 1985. Assuming that these trends continue, determine the percentages of Americans who own cars of each size in 1995 and the corresponding eventual percentages.A consumer products testing group is evaluating two competing brands of tires, Brand 1 and Brand 2. Tread wear can vary considerably depending on the type of car, and the group is trying to eliminate this effect by installing the two brands on the same 10 cars, chosen at random. In particular, each car has one tire of each brand on its front wheels, with half of the cars chosen at random to have Brand 1 on the left front wheel, and the rest to have Brand 2 there. After all of the cars are driven over the standard test course for 20,000 miles, the amount of tread wear (in inches) is recorded, as shown in the table below. Car 1 2 3 4 5 6 7 8 9 10 Brand 1 0.54 0.62 0.37 0.42 0.58 0.50 0.53 0.64 0.53 0.40 Brand 2 0.39 0.33 0.33 0.33 0.28 0.46 0.29 0.55 0.45 0.37 Difference(Brand 1 - Brand 2) 0.15 0.29 0.04 0.09 0.30 0.04 0.24…
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