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7. Let u be the amount of plaque buildup 14 days after having teeth cleaned by...
In a study on the effect of an oral rinse on plaque buildup on teeth, sixteen...
In a study on the effect of an oral rinse on plaque buildup on teeth, sixteen people whose teeth were thoroughly cleaned and polished were randomly assigned to two groups of eight subjects each. Both groups were assigned to use oral rinses (no brushing) for a 2-week period. Group 1 used a rinse that contained an antiplaque agent. Group 2, the control group, received a similar rinse except that the rinse contained no antiplaque agent. A measure of plaque buildup...
A study was conducted on the effect of an oral antiplaque rinse on plaque buildup on...
A study was conducted on the effect of an oral antiplaque rinse on plaque buildup on teeth. Twelve people whose teeth were thoroughly cleaned and polished were randomly assigned to two groups of six subjects each. Both groups were assigned to use oral rinses (no brushing) for a two-week period. Group 1, the control group, received a rinse that, unknown to the subjects, contained no antiplaque agent. Group 2 used a rinse that contained an antiplaque agent. A plaque index...
A study was conducted on the effect of an oral antiplaque rinse on plaque buildup on...
A study was conducted on the effect of an oral antiplaque rinse on plaque buildup on teeth. Eighteen people whose teeth were thoroughly cleaned and polished were randomly assigned to two groups of nine subjects each. Both groups were assigned to use oral rinses (no brushing) for a two-week period. Group 1, the control group, received a rinse that, unknown to the subjects, contained no antiplaque agent. Group 2 used a rinse that contained an antiplaque agent. A plaque index...
-/2 POINTS MY NOTES ASK YOUR TEACHER Let x represent the dollar amount spent on supermarket...
-/2 POINTS MY NOTES ASK YOUR TEACHER Let x represent the dollar amount spent on supermarket impulse buying in a 10-minute (unplanned) shopping interval. Based on a certain article, the mean of the x distribution is about $42 and the estimated standard deviation is about $7. (a) Consider a random sample of n = 80 customers, each of whom has 10 minutes of unplanned shopping time in a supermarket. From the central limit theorem, what can you say about the...
hi there, having trouble with stats homework In a random sample of 22 people, the mean...
hi there, having trouble with stats homework
In a random sample of 22 people, the mean commute time to work was 31.5 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval fo the population mean u. What is the margin of error of u? Interpret the results. The confidence interval for the population mean u is ( 29.4, 33.6) (Round to one decimal place as...
10. Based on a random sample of size 7 from a normal distribution with mean u,...
10. Based on a random sample of size 7 from a normal distribution with mean u, a confidence interval is constructed for y. The sample standard deviation is calculated as 5.4763. Let tay be the critical value of a t random variable with v degrees of freedom. The following table lists values of ta, for specific combinations of a and v: a=0.1 1.440 1.415 a= 0.05 1.943 v=6 v=7 a= 0.025 2 .447 2.365 1.895 If we want to be...
A new diet that promises a fast loss of weight is launched. The change in weight after a week on the diet is modelled using a Normal distribution with mean u and variance σ2. Let z, . . . , zn be an...
A new diet that promises a fast loss of weight is launched. The change in weight after a week on the diet is modelled using a Normal distribution with mean u and variance σ2. Let z, . . . , zn be an independent sample from this Normal. (a) Knowing that μ z, find the method of moments estimator for σ. [4] (b) State (without deriving) an alternative estimator you know for σ2. Give one reason why one would prefer...
a normal distribution has u=20 and o=4 ttempts: Average: 14 Aa Aa 5. Computing a confidence...
a normal distribution has u=20 and o=4
ttempts: Average: 14 Aa Aa 5. Computing a confidence interval Consumers with at least one credit card have a mean of 484 credit cards. [Source: Argawal, S., Driscoll, J. Gabaix, ?., & Laibson, D. (February, 2008), Learning in the creditcard market (Working Paper i 3822), National Bureau of Economic Research (NBER).] A social psychologist wants to estimate how much having a high income (an annual income over $100,000) changes the number of credit...
Find the sampling error: u = -5, B = -2.5, n= 100 -7.5 -2.5 0.25 2.5...
Find the sampling error: u = -5, B = -2.5, n= 100 -7.5 -2.5 0.25 2.5 Find M, and o, the mean and standard deviation of the sampling distribution of x: H= 25, 0=5, n= 10. M =25, o,=0.5 M =25, o,=1.58 M=2.5, o,=0.5 My=7.91, o,=1.58 B) A) Assume that the random variable X is normally distributed with mean = 52 and standard deviation = 10. Let n = 25. Find P(x>50). -0 0.16 0.84 D) A) B) C) D)...
Please help solve problem #14. Thank you! 383 Section 7.2 Estimating u When a Is Unknown In Problems 13-19, assume that...
Please help solve problem #14. Thank you!
383 Section 7.2 Estimating u When a Is Unknown In Problems 13-19, assume that the population of x values has an approximately normal distribution 13. | Archaeology: Tree Rings At Burnt Mesa Pueblo, the method of tree-ring dating gave the following years A.D. for an archaeological excavation site (Bandelier Archaeological Excavation Project: Summer 1990 Excavations at Burnt Mesa Pueblo, edited by Kohler, Washington State University): 1275 1317 1275 1316 1268 1271 1267 1272...
A study was conducted on the effect of an oral antiplaque rinse on plaque buildup on teeth. Twelve people whose teeth were thoroughly cleaned and polished were randomly assigned to two groups of six subjects each. Both groups were assigned to use oral rinses (no brushing) for a two-week period. Group 1, the control group, received a rinse that, unknown to the subjects, contained no antiplaque agent. Group 2 used a rinse that contained an antiplaque agent. A plaque index...
A study was conducted on the effect of an oral antiplaque rinse on plaque buildup on teeth. Eighteen people whose teeth were thoroughly cleaned and polished were randomly assigned to two groups of nine subjects each. Both groups were assigned to use oral rinses (no brushing) for a two-week period. Group 1, the control group, received a rinse that, unknown to the subjects, contained no antiplaque agent. Group 2 used a rinse that contained an antiplaque agent. A plaque index...
-/2 POINTS MY NOTES ASK YOUR TEACHER Let x represent the dollar amount spent on supermarket impulse buying in a 10-minute (unplanned) shopping interval. Based on a certain article, the mean of the x distribution is about $42 and the estimated standard deviation is about $7. (a) Consider a random sample of n = 80 customers, each of whom has 10 minutes of unplanned shopping time in a supermarket. From the central limit theorem, what can you say about the...
hi there, having trouble with stats homework
In a random sample of 22 people, the mean commute time to work was 31.5 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval fo the population mean u. What is the margin of error of u? Interpret the results. The confidence interval for the population mean u is ( 29.4, 33.6) (Round to one decimal place as...
10. Based on a random sample of size 7 from a normal distribution with mean u, a confidence interval is constructed for y. The sample standard deviation is calculated as 5.4763. Let tay be the critical value of a t random variable with v degrees of freedom. The following table lists values of ta, for specific combinations of a and v: a=0.1 1.440 1.415 a= 0.05 1.943 v=6 v=7 a= 0.025 2 .447 2.365 1.895 If we want to be...
A new diet that promises a fast loss of weight is launched. The change in weight after a week on the diet is modelled using a Normal distribution with mean u and variance σ2. Let z, . . . , zn be an independent sample from this Normal. (a) Knowing that μ z, find the method of moments estimator for σ. [4] (b) State (without deriving) an alternative estimator you know for σ2. Give one reason why one would prefer...
a normal distribution has u=20 and o=4
ttempts: Average: 14 Aa Aa 5. Computing a confidence interval Consumers with at least one credit card have a mean of 484 credit cards. [Source: Argawal, S., Driscoll, J. Gabaix, ?., & Laibson, D. (February, 2008), Learning in the creditcard market (Working Paper i 3822), National Bureau of Economic Research (NBER).] A social psychologist wants to estimate how much having a high income (an annual income over $100,000) changes the number of credit...
Find the sampling error: u = -5, B = -2.5, n= 100 -7.5 -2.5 0.25 2.5 Find M, and o, the mean and standard deviation of the sampling distribution of x: H= 25, 0=5, n= 10. M =25, o,=0.5 M =25, o,=1.58 M=2.5, o,=0.5 My=7.91, o,=1.58 B) A) Assume that the random variable X is normally distributed with mean = 52 and standard deviation = 10. Let n = 25. Find P(x>50). -0 0.16 0.84 D) A) B) C) D)...
Please help solve problem #14. Thank you!
383 Section 7.2 Estimating u When a Is Unknown In Problems 13-19, assume that the population of x values has an approximately normal distribution 13. | Archaeology: Tree Rings At Burnt Mesa Pueblo, the method of tree-ring dating gave the following years A.D. for an archaeological excavation site (Bandelier Archaeological Excavation Project: Summer 1990 Excavations at Burnt Mesa Pueblo, edited by Kohler, Washington State University): 1275 1317 1275 1316 1268 1271 1267 1272...
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