Search & Filtering
You want to estimate the mean weight of quarters in circulation. A sample of 60 quarters has a mean weight of 5.625 grams and a standard deviation of 0.063 gram. Use a single value to estimate the mean weight of all quarters. Also, find the 95% confidence interval for the average weight of all quarters.
The estimate for the mean weight of all quarters is ___ grams?
RCH tumor incidents followed a
Poisson distribution with λ = 4 tumors per eye for patients with VHL. Using this model, find the probability
that in a randomly selected patient with VHL:
(a) There are exactly five occurrences of tumors per eye.
(b) There are more than five occurrences of tumors per eye.
(c) There are fewer than five occurrences of tumors per eye.
(d) There are between five and seven occurrences of tumors per eye, inclusive.
a) Identify and shortly explain in what conditions researchers use random and non-random sampling techniques.
b) Differentiate stratified and cluster sampling with examples.
A marketing research analyst selects a random sample of ten customers out of the fourty
who purchased a particular item from central store. The ten customers purchased different item
from central store i.e. 11, 37, 25, 62, 51, 21, 18, 41, 32, 20. If a random sample of ten items are
selected, what is the probability that customer will have a mean item which is a) at least thirty
one b) at most fifty five c) between thirty nine and fifty six d) mean item is fifty percent and e)
mean item is hundred percent.
Direction: Provide step by step solutions to the given problem below. Write your answers on the spaces provided. Joe, a DOH Covid-19 tracker, found out that the number of infected persons of Covid-19 in seven low-risk provinces of the country are 1, 9, 2, 12, 8, 7, and 10. Suppose that 5 provinces are drawn as sample.
The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. The expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of$110 and a standard deviation of $20. If the management decides to give free gifts to all those customers who spend more than $150 at this supermarket during a visit, what percentage of the customers are expected to get free gifts?
ACTIVITY: The average cholesterol content of a certain canned good is 215 mg, and the standard deviation is 15 mg. Assume that the variable is normally distributed. If a sample of 25 canned goods are selected, what is the probability that the mean of the sample will be larger than 220 mg
The average cholesterol content of a certain canned good is 215 mg, and the standard
deviation is 15 mg. Assume that the variable is normally distributed. If a sample of 25 canned goods
are selected, what is the probability that the mean of the sample will be larger than 220 mg
Telephone calls are being placed through a certain exchange at random times on the
average of four per minute. Assuming a Poisson process, determine the probability
that in a 15-second intervals, there are 3 or more calls.
A bag contains 3 white, 1 black and 3 red ball. Two balls are drawn from the well
shaked bag. Find the probability of both the balls being black and its mean.
#339914 on Dec 2023