Your friend claims to have more significant results than you because their group had, on average,...
Your friend claims to have more significant results than you because their group had, on average, fewer cavities. You claim that their results were not significant at the .05 level, even though their study had fewer cavities, on average. Complete a 6-step hypothesis test, using your friend's results, that the Oral-B 3D toothbrush combats tooth decay at the .05 level of significance.
Your best friend would like to attend dental school, and wants to study the effects of using the Oral-B 3D toothbrush. They randomly select 21 college students and asks them to use the toothbrush for 1 year. After that year, those 21 students have the following number of cavities:
0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 1, 0, 0, 1, 4, 0, 1
Your friend claims to have more significant results than you because their group had, on average, fewer cavities. You claim that their results were not significant at the .05 level, even though their study had fewer cavities, on average. Complete a 6-step hypothesis test, using your friend's results, that the Oral-B 3D toothbrush combats tooth decay at the .05 level of significance.
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Your friend claims to have more
significant results than you because their group had, on average,...
A manufacturer of calculator batteries claims that the average lifespan of her batteries is more than...
A manufacturer of calculator batteries claims that the average lifespan of her batteries is more than 1300 hours. a. Set up the null and alternative hypothesis needed to substantiate this claim, as if you had reason to believe that this claim is not being met. b. A sample of 16 batteries is tested and it is found that the sample mean is 1280 hours and σ = 40 hours. Do a test of your null hypothesis at the 1% significance...
1. A computer company claims that its laptop batteries average more than 4.5 hours of use...
1. A computer company claims that its laptop batteries average more than 4.5 hours of use per charge with a standard deviation of 0.7 hours. A sample of 45 batteries last an average of 4.72 hours. At the .05 level of significance, is there evidence to support the claim that the batteries last more than 4.5 hours?
A manufacturer claims his light bulbs have a mean life of 2000 hours. A consumer group...
A manufacturer claims his light bulbs have a mean life of 2000 hours. A consumer group wants to test if their light bulbs do not last as long as the manufacturer claims. They tested a random sample of 210 bulbs and found them to have a sample mean life of 1980 hours and a sample standard deviation of 50 hours. Assess the manufacturer's claim. a) What is the null hypothesis? Ou = 2000 O x = 2000 Ox< 2000 Ou...
A manufacturer claims his light bulbs have a mean life of 1800 hours. A consumer group...
A manufacturer claims his light bulbs have a mean life of 1800 hours. A consumer group wants to test if their light bulbs do not last as long as the manufacturer claims. They tested a random sample of 230 bulbs and found them to have a sample mean life of 1790 hours and a sample standard deviation of 50 hours. Assess the manufacturer's claim. a) What is the null hypothesis? 正确:D=1800 错误x = 1800 错误x<1800 错误p> 1800 正确答案! 以前的尝试 您的证明编号是153-43332...
help, thank you Do college students enjoy playing sports more than watching sports? A researcher randomly...
help, thank you
Do college students enjoy playing sports more than watching sports? A researcher randomly selected ten college students and asked them to rate playing sports and watching sports on a scale from 1 to 10 with 1 meaning they have no interest and 10 meaning they absolutely love it. The results of the study are shown below. Playing Vs. Watching Sports Play 8 10 4 6 5 10 6 10 4 2 Watch 9 8 5 5 3...
Your friend tells you that the proportion of active Major League Baseball players who have a...
Your friend tells you that the proportion of active Major League Baseball players who have a batting average greater than .300 is less than 0.7, a claim you would like to test. The hypotheses here are Null Hypothesis: p ≥ 0.7, Alternative Hypothesis: p < 0.7. If you take a random sample of players and calculate p-value for your hypothesis test of 0.3030, what is the appropriate conclusion? Conclude at the 5% level of significance. Question 15 options: 1) The...
Your friend tells you that the proportion of active Major League Baseball players who have a...
Your friend tells you that the proportion of active Major League Baseball players who have a batting average greater than .300 is less than 0.77, a claim you would like to test. The hypotheses here are Null Hypothesis: p ≥ 0.77, Alternative Hypothesis: p < 0.77. If you take a random sample of players and calculate p-value for your hypothesis test of 0.1427, what is the appropriate conclusion? Conclude at the 5% level of significance. Question 6 options: 1) We...
A study was done to look at the relationship between the number of lovers college students...
A study was done to look at the relationship between the number of lovers college students have had in their lifetimes and their GPAs. The results of the survey are shown below. Lovers 0 2 6 6 1 5 2 0 5 GPA 3.4 3.6 2.9 2.2 3.7 3.1 3.6 3.2 2.8 x value y value Find the correlation coefficient: r=r= Round to 2 decimal places. The null and alternative hypotheses for correlation are: H0:H0: ? ρ r μ == 0 H1:H1:...
A sociologist claims that children spent more time watching television in 1981 than children do today....
A sociologist claims that children spent more time watching television in 1981 than children do today. A study was conducted in 1981 to find the time that children watched television on weekdays. Recently, a similar study was conducted. The results of these studies (in hours per weekday are shown below. Assume the population standard deviation is 0.7 for 1981 and 0.8 for today, At a = 0.05, can you support the sociologist's claim? Complete parts (a) through (d) below. Full...
bus A study was done to look at the relationship between number of lovers college students...
bus A study was done to look at the relationship between number of lovers college students have had in their lifetimes and their GPAs. The results of the survey are shown below. ules es Lovers GPA 2 4 4 6 2.63.22.8 2.6 3.23.1 2.9 2.4 2.3 ale e 365 edia ia Gallery ary les Tuition ment edible a. Find the correlation coefficient: Round to 2 decimal places. b. The null and alternative hypotheses for correlation are: HO:?V0 H:? The p-value...
1. A computer company claims that its laptop batteries average more than 4.5 hours of use per charge with a standard deviation of 0.7 hours. A sample of 45 batteries last an average of 4.72 hours. At the .05 level of significance, is there evidence to support the claim that the batteries last more than 4.5 hours?
A manufacturer claims his light bulbs have a mean life of 2000 hours. A consumer group wants to test if their light bulbs do not last as long as the manufacturer claims. They tested a random sample of 210 bulbs and found them to have a sample mean life of 1980 hours and a sample standard deviation of 50 hours. Assess the manufacturer's claim. a) What is the null hypothesis? Ou = 2000 O x = 2000 Ox< 2000 Ou...
A manufacturer claims his light bulbs have a mean life of 1800 hours. A consumer group wants to test if their light bulbs do not last as long as the manufacturer claims. They tested a random sample of 230 bulbs and found them to have a sample mean life of 1790 hours and a sample standard deviation of 50 hours. Assess the manufacturer's claim. a) What is the null hypothesis? 正确:D=1800 错误x = 1800 错误x<1800 错误p> 1800 正确答案! 以前的尝试 您的证明编号是153-43332...
help, thank you
Do college students enjoy playing sports more than watching sports? A researcher randomly selected ten college students and asked them to rate playing sports and watching sports on a scale from 1 to 10 with 1 meaning they have no interest and 10 meaning they absolutely love it. The results of the study are shown below. Playing Vs. Watching Sports Play 8 10 4 6 5 10 6 10 4 2 Watch 9 8 5 5 3...
A sociologist claims that children spent more time watching television in 1981 than children do today. A study was conducted in 1981 to find the time that children watched television on weekdays. Recently, a similar study was conducted. The results of these studies (in hours per weekday are shown below. Assume the population standard deviation is 0.7 for 1981 and 0.8 for today, At a = 0.05, can you support the sociologist's claim? Complete parts (a) through (d) below. Full...
bus A study was done to look at the relationship between number of lovers college students have had in their lifetimes and their GPAs. The results of the survey are shown below. ules es Lovers GPA 2 4 4 6 2.63.22.8 2.6 3.23.1 2.9 2.4 2.3 ale e 365 edia ia Gallery ary les Tuition ment edible a. Find the correlation coefficient: Round to 2 decimal places. b. The null and alternative hypotheses for correlation are: HO:?V0 H:? The p-value...
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