Question

Suppose Jason read an article stating that in a 2003‑2004 survey, the average American adult age 19‑30 drank an average of 1.47 liters of plain water per day with a standard deviation of 0.09 liters. Jason wants to find out if the men at his college drink a similar amount per day. He asks a random sample of 45 male students in his college to record the amount of water they drink in one day, and he is willing to assume that the standard deviation at his college is the same as in the 2003‑2004 survey. The sample mean liters of water in Jason's sample is 1.52. Jason wants to determine a rough approximation of the 95% confidence interval for ? , the average amount of water the men at his college drink per day. Enter the lower and upper limits of the approximate 95% confidence interval for the mean amount of water that the male students drink per day. Round your final answer to four decimal places.

Answer #1

Attempt 3
Suppose Jason read an article stating that in a 2003–2004
survey, the average American adult woman aged 19–30 drank an
average of 1.04 liters of plain water per day with a standard
deviation of 0.11 liters. Jason wants to find out if the women at
his college drink a similar amount per day. He asks 45 of his
female classmates in his Introductory Economics class to record the
amount of water they drink in one day, and he...

A survey conducted by the American Automobile Association showed
that a family of four spends an average of $215.60 per day while on
vacation. Suppose a sample of 64 families of four vacationing at
Niagara Falls resulted in a sample mean of $252.45 per day and a
sample standard deviation of $75.50.
a. Develop a 95% confidence interval estimate of the mean amount
spent per day by a family of four visiting Niagara Falls (to 2
decimals).
( , )
b. Based...

A survey conducted by the American Automobile Association showed
that a family of four spends an average of $215.60 per day while on
vacation. Suppose a sample of 64 families of four vacationing at
Niagara Falls resulted in a sample mean of $252.45 per day and a
sample standard deviation of $78.50.
a. Develop a 95% confidence interval estimate of the mean amount
spent per day by a family of four visiting Niagara Falls (to 2
decimals). ( ___ ,...

question 1. A marketing specialist wants to
estimate the average amount spent by visitors to an online
retailer's newly-designed website. From the data in a preliminary
study she guesses that the standard deviation of the amount spent
is about 16 dollars.
How large a sample should she take to estimate the mean amount
spent to within 4 dollars with 95% confidence? (Round your answer
up to the next largest integer).
______
question 2. Pepsi wants to use this technique
to...

PART A) You own a small storefront retail business and are
interested in determining the average amount of money a typical
customer spends per visit to your store. You take a random sample
over the course of a month for 14 customers and find that the
average dollar amount spent per transaction per customer is
$109.477 with a standard deviation of $11.8571. Create a 90%
confidence interval for the true average spent for all customers
per transaction.
PART B) Researchers...

1. For a pair of sample x- and y-values, what is the difference
between the observed value of y and the predicted value of y? a) An
outlier b) The explanatory variable c) A residual d) The response
variable
2. Which of the following statements is false:
a) The correlation coefficient is unitless. b) A correlation
coefficient of 0.62 suggests a stronger correlation than a
correlation coefficient of -0.82. c) The correlation coefficient,
r, is always between -1 and 1....

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