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A toothpaste manufacturer wants to determine whether the addition of a certain chemical to their toothpaste will increase its ability to fight tooth decay. A group of 100 people are chosen and an experiment is conducted. Of the 100 people using the toothpaste with the chemical addition for a specified period of time, the manufacturer finds that they have an average of 8 cavities and a standard deviation of 3 cavities. It turns out that the sample standard deviation correctly estimates the population standard deviation. The average number of cavities of people using the toothpaste without the chemical addition is known to be 9, based on a long term study that the company performed a couple of years ago. Can we conclude at the 1% level of significance that the addition of the chemical made a difference the toothpaste's ability to fight tooth decay? Perform an appropriate hypothesis test with all of the necessary steps.
Is there any evidence to suggest that the true mean time to complete the safety checkup is greater than 30 minutes?
After an introductory statistics course, 80% of students can successfully construct box plots. Of those who can construct box plots, 86% passed
College. Every year US News and World Report publishes a special issue on many U.S. colleges and universities.
Following data represent concentration of dissolved organic carbon (mg/L) collected from 20 samples of organic soil. Sample standard deviation is?
The weights of newborn baby boys born at a local hospital are normally distributed with mean µ = 118 ounces and standard deviation s = 9.5 ounces
A clever, rich, and wealthy local politician promises to give you $1,000 on the first day of four months before elections. From here on he will give you 9/10 of the amount he gave you the day before.
Find the number of seats that each restaurant should have in order to have a probability greater than 95 % that it can serve all patrons who come to it.
Sketch a scatterplot in which the presence of an outlier decreases the observed correlation between the response and explanatory variables. Indicate on your plot which point is the outlier.
a sample of size 21 is taken and a significance test for h0 u 0 versus ha u doesnt equal 0 is run. the test
1. Rabbits like to eat the cucumbers in Mimi's garden. There are 10 cucumbers in her garden which will be ready to harvest in about 10 days. Based on her experience, the probability of a cucumber being eaten by the rabbits before harvest is 0.30.
suppose a recent poll of american househoolds about pet ownership found that for households with one pet 39 owned a dog
use the following information to answer the three items belowin a certain large forest 25 of all the beech trees show
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