A dentist wants to know if the flavor of toothpaste affects how often children brush their...

A dentist wants to know if the flavor of toothpaste affects how often children brush their teeth, and therefore the number of cavities they develop. She makes 3 different flavors of toothpaste: regular, bubble gum, and cherry. She randomly selects 9 children into one of three conditions and collects data about the number of cavities they have at a 60-month check-up. Here are the data (number of cavities detected at check-up:

Regular Flavor		Bubble Gum Flavor		Cherry Flavor
Child	Cavities	Child	Cavities	Child	Cavities
1	7	4	4	7	3
2	9	5	5	8	1
3	9	6	3	9	1

What is the value of the between-groups mean square?

What is the value of the within-groups mean square?

What is the Fobt value?

What is the F_crit value, assuming a α = 0.05?

What would you conclude?

Using Tukey’s HSD, determine if Group 1 (Regular Flavor) has significantly more cavities than Group 3 (Cherry Flavor). Assume alpha of .05 when determining q_crit.

must show work.

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

A researcher is studying how the fear of going to the dentist affects an adult's actual...

A researcher is studying how the fear of going to the dentist affects an adult's actual number of visits to the dentist. She asks a random sample of adults whether or not they fear going to the dentist and also how many times they have gone in the past 10 years. She would like to assess if the average number of visits made by adults who fear going to the dentist (Group 1) is higher than the average number of...

A retail corporation wants to know how often a customer returns items in a year. The...

A retail corporation wants to know how often a customer returns items in a year. The company’s data analytics team analyzed customers’ shopping behavior and came up with three categories of customers. Customers in category 1 do not return items often. Customers in category 2 return some items, and customers in category 3 heavily return items. Suppose that the data analytics team modeled the number of returns in each category of customers according to a Poisson process with rates λ1...

A animal behaviorist wants to know how exercise affects behavior of aggressive dogs. She finds a...

A animal behaviorist wants to know how exercise affects behavior of aggressive dogs. She finds a sample of 30 aggressive dogs and randomly divides them into three groups. Over one week, one group is exercised for 20 minute per day, one for one hour per day, and one for 2 hours per day. The number of aggressive behaviors (lunging, biting, snarling, etc.) is recorded for the dogs in each group. State the population(s) of interest. Identify the parameter(s) of interest....

3) A concession manager at Yankee Stadium wants to know how temperature affects beer sales. She...

3) A concession manager at Yankee Stadium wants to know how temperature affects beer sales. She took a sample of 10 games and recorded the number of beers sold and the temperature in the middle of the game. Temperature 80 68 78 79 87 74 86 92 77 84 Number of Beers 20533 1439 13829 21286 30985 17187 30240 87596 9610 28742 a. Draw a scatter plot of the data. b. The manager estimates the regression equation to be: numberofbeers...

A toy manufacturer wants to know how many new toys children buy each year. A sample...

A toy manufacturer wants to know how many new toys children buy each year. A sample of 499 children was taken to study their purchasing habits. Construct the 90% confidence interval for the mean number of toys purchased each year if the sample mean was found to be 5.6. Assume that the population standard deviation is 1.9.

A toy manufacturer wants to know how many new toys children buy each year. A sample...

A toy manufacturer wants to know how many new toys children buy each year. A sample of 314 children was taken to study their purchasing habits. Construct the 90% confidence interval for the mean number of toys purchased each year if the sample mean was found to be 5.1. Assume that the population standard deviation is 1.31.3. Round your answers to one decimal place.

An obstetrician wants to know whether or not the proportions of children born on each day...

An obstetrician wants to know whether or not the proportions of children born on each day of the week are the same. She randomly selects 500 birth records and obtains the data shown in table. Is there reason to believe that the day on which a child is born occurs with equal frequency at the alpha= 0.01. Sunday Monday Tuesday Wednesday Thursday Friday Saturday Observed count (O) 46 76 83 81 81 80 53 PLEASE FOLLOW THE STEPS BELOW: You...

EXPERIMENT ONE On a standard test of attention span in children, Dr. Niederjohn wants to know...

EXPERIMENT ONE On a standard test of attention span in children, Dr. Niederjohn wants to know whether attention span is different in children who play video games extensively. He selects a sample of children who regularly play video games and those who do not and obtains the following attention-span data: Video No Video 23 19 19 17 28 24 21 21 24 27 27 21 28 23 23 18 25 19 23 22 1. Give the M and SD for each...

A social sciences researcher wants to know about the amount of money that couples without children...

A social sciences researcher wants to know about the amount of money that couples without children spend on leisure travel. Her sample of 28 couples yields a mean of $1263.00 and a standard deviation of $160.00. What is the margin of error for a 95% confidence interval?

A medical professional wants to know if there more children diagnosed with Autism Spectrum Disorder (ASD)...

A medical professional wants to know if there more children diagnosed with Autism Spectrum Disorder (ASD) in states that have larger urban areas over states that are mostly rural. So she sampled 8-year old children in two states: Pennsylvania and Utah. In the state of Pennsylvania, a fairly urban state, there are 245 eight year olds diagnosed with ASD out of 18,440 eight year olds evaluated. In the state of Utah, a fairly rural state, there are 45 eight year...

Subjects