A recent survey found that about 72.5% of all gasoline purchases at a certain service station...

A recent survey found that about 72.5% of all gasoline purchases at a certain service station chain are paid with a credit or debit card. If 300 gasoline purchases completed at this chain are randomly selected, find the probability that at most 210 of those purchases are paid with a credit or debit card. Use a TI-83, TI-83 plus, or TI-84 calculator to find the probability.

Expert Solution

orchestra answered 2 years ago

A service station owner believes that an equal number of customers prefer to buy gasoline on...

A service station owner believes that an equal number of customers prefer to buy gasoline on every day of the week. A manager at the service station disagrees with the owner and claims that the number of customers who prefer to buy gasoline on each day of the week varies. Test the manager’s claim using alpha = 0.10. The owner surveyed 739 customers over a period of time to record each customer’s preferred day of the week. Here is what...

A recent survey found that 22% of all people 16 years of age and older do...

A recent survey found that 22% of all people 16 years of age and older do volunteer work. Suppose a random sample of 350 people 16 years of age and older is taken. What is the probability that more than 24% of the people in the sample do volunteer work? a) 0.1894 b) 0.8106 c) 0.1841 d) 0.8159

A recent survey found that 70% of all adults over 50 wear glasses for driving. In...

A recent survey found that 70% of all adults over 50 wear glasses for driving. In a random sample of 10 adults over 50, what is the probability that exactly six wear glasses? Please round answer to the ten-thousandths place (4 places).

A recent survey found that 63% of all adults over 50 wear glasses for driving. Ia...

A recent survey found that 63% of all adults over 50 wear glasses for driving. Ia random sample of 100 adults over 50 was selected., a). what is the expected value and standard deviation of the number of adults over 50 who wear glasses? b). Find the probability that more than 60 of the adults over 50 wear glasses. Hint: using normal distribution to approximate binomial distribution.

A recent survey examined the use of social media platforms. Suppose the survey found that there...

A recent survey examined the use of social media platforms. Suppose the survey found that there is a 0.61 probability that a randomly selected person will use Facebook and a 0.28 probability that a randomly selected person will use LinkedIn. In addition, suppose there is a 0.26 probability that a randomly selected person will use both Facebook and LinkedIn. (a) What is the probability that a randomly selected person will use Facebook or LinkedIn? (b) What is the probability that...

In a recent survey of high school students, it was found that the amount of time...

In a recent survey of high school students, it was found that the amount of time spent on reading books per week was normally distributed with a mean of 32 minutes. Assume the distribution of weekly reading time follows the normal distribution with a population standard deviation of 2 minutes. Suppose we select a sample of 20 high school students. a. What is the standard error of the mean time? Answer b. What percent of the sample means will be...

In a recent survey conducted by Pew Research, it was found that 156 of 295 adult...

In a recent survey conducted by Pew Research, it was found that 156 of 295 adult Americans without a high school diploma were worried about having enough saved for retirement. Does the sample evidence suggest that a majority of adult Americans without a high school diploma are worried about having enough saved for retirement? Use a 0.05 level of significance. State the null and alternative hypothesis What type of hypothesis test is to be used? What distribution should be used...

In a recent survey of 200 Instagram users, it was found that 71% of them were...

In a recent survey of 200 Instagram users, it was found that 71% of them were under the age of 35. Create and interpret a 95% Confidence Interval for the percentage of Instagram under the age of 35 using PANIC.

Suppose that a recent poll found that 40 % of adults in a certain country believe...

Suppose that a recent poll found that 40 % of adults in a certain country believe that the overall state of moral values is poor. If a survey of a random sample of 15 adults in this country is conducted in which they are asked to disclose their feelings on the overall state of moral values, complete parts (a) through (e) below. (a) Find and interpret the probability that exactly 8 of those surveyed feel the state of morals is...

In a recent survey, it was found that 118 out of 500 randomly selected junior high...

In a recent survey, it was found that 118 out of 500 randomly selected junior high school students enjoyed their math class the most. It was also found that 192 out of 1000 randomly selected high school students enjoyed their math class the most. Test the hypothesis that the percentage of junior high school students who enjoy their math class the most is different than the percentage of high school students who enjoy their math class the most. Use the...

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