Question
In: Statistics and Probability
Q5. I recorded the annual salaries of 300 employees of a chain computer stores. The mean...
Q5. I recorded the annual salaries of 300 employees of a chain computer stores. The mean and standard deviation are $28,000 and $3,000. If the data show a bell-shaped curve,
a) how many employees receive salaries between $25,000 and $31,000?
Answer: 300 x ( ) = ( ) employees.
b) how many employees receive salaries between 22,000 and 34,000?
Answer: 300 x ( ) = ( ) employees.
c) how many between 37,000 and 19,000?
Answer: 300 x ( ) = ( ) employees.
Q7. I recorded the annual salaries of the employees of a chain computer stores. The mean and standard deviation are $38,000 and $3,000. If the data show a bell-shaped curve, 95% of the employees receive salaries between ( ) and ( ).
Q8. I took the midterm last week and the professor told me only the average score (=80) and the standard deviation (=4). Since there are about 4-5 students who never show up in class, I would assume that the score distribution is NOT bell-shaped. Given that we have 30 students in this class, at least how many students scored between 72 and 88?
Answer: At least 30 x ( ) = At least ( ) firms
Solutions
orchestra answered 1 year agoRelated Solutions
a salary adjustment was given to two retail stores recently merged. Ten employees' salaries were recorded...
a salary adjustment was given to two retail stores recently
merged. Ten employees' salaries were recorded before and after the
adjustment. The average difference was an increase of $2,250 with a
standard deviation of $1,100. Test if the increase is significant
at the .10 level?
Suppose annual salaries for sales associates from Geoff's Computer Shack have a mean of $32,500 and...
Suppose annual salaries for sales associates from Geoff's
Computer Shack have a mean of $32,500 and a standard deviation of
$2,500.
a.
Calculate and interpret the z-score for a sales
associate who makes $36,000.
b.
Suppose that the distribution of annual salaries for sales
associates at this store is bell-shaped. Use the empirical rule to
calculate the percentage of sales associates with salaries between
$27,500 and $37,500.
c.
Use the empirical rule to determine the percentage of sales
associates with...
1. Suppose annual salaries for sales associates from Geoff's Computer Shack have a mean of $32,500...
1.
Suppose annual salaries for sales associates from Geoff's
Computer Shack have a mean of $32,500 and a standard deviation of
$2,500.
a.
Calculate and interpret the z-score for a sales
associate who makes $36,000.
b.
Suppose that the distribution of annual salaries for sales
associates at this store is bell-shaped. Use the empirical rule to
calculate the percentage of sales associates with salaries between
$27,500 and $37,500.
c.
Use the empirical rule to determine the percentage of sales
associates...
The annual salaries (in thousands of dollars) for the employees of a small technology firm are...
The annual salaries (in thousands of dollars) for the employees
of a small technology firm are as follows:
73
70
59
80
71
70
81
73
71
72
73
66
74
70
71
70
77
73
72
71
75
74
73
84
Construct a frequency table. Use 7 classes, start with a lower
class limit of 59, and use a whole number for the class width.
Annual Salaries
Frequency
Answer
-
Answer
Answer
Answer
-
Answer
Answer
Answer
-
Answer...
Two computer stores recorded the number of computers sold in a week along with the sizes...
Two computer stores recorded the number of computers sold in a
week along with the sizes of their hard drives. At a = .05, test
the claim that the distribution of hard drives and the store where
the computers were bought are not related.
store one sold 13 20gb, 11 40gb, 11 80gb, 8 160gb.
store two sold 104 20gb, 33 40gb, 15 80 gb, 10 160gb
Hypothesis with claim
Draw Curve
Critical Value
Test Value
Decision
Summary
Two computer stores recorded the number of computers sold in a week along with the sizes...
Two computer stores recorded the number of computers sold in a
week along with the sizes of their hard drives. At a = .05, test
the claim that the distribution of hard drives and the store where
the computers were bought are not related.
store one sold 13 20gb, 11 40gb, 11 80gb, 8 160gb.
store two sold 104 20gb, 33 40gb, 15 80 gb, 10 160gb
Hypothesis with claim
Draw Curve
Critical Value
Test Value
Decision
Summary
A local franchise of a national chain of day-old pastry stores recorded the number of customers...
A local franchise of a national chain of day-old pastry stores
recorded the number of customers that came in to the store for five
weeks this fall. These data are recorded in the attached file. The
national franchisor states that the percentage of customers is
distributed as follows: Sunday – 20%, Monday – 8%,
Tuesday – 6%, Wednesday – 7%, Thursday – 12%, Friday – 22%, and
Saturday – 25%. The manager doesn’t trust the franchisor and wants
to show...
An economic surveys 31 adults living is Townsburg about their salaries. The mean annual salaries for...
An economic surveys 31 adults living is Townsburg about their
salaries. The mean annual salaries for those surveyed was found to
be x̄ = $47,782, with a standard deviation of $2,488.
a) Find a 90% confidence interval for the true mean annual
salary of adults living in Townsburg.
b) Provide the margin of error of the interval
as your answer.
Round your answer to the nearest dollar.
Sample annual salaries? (in thousands of? dollars) for employees at a company are listed. 50 50??...
Sample annual salaries? (in thousands of? dollars) for employees
at a company are listed. 50 50?? 47 47?? 59 59?? 54 54?? 28 28?? 28
28?? 50 50?? 47 47?? 59 59?? 27 27?? 54 54?? 50 50?? 45 45 ?(a)
Find the sample mean and sample standard deviation. ?(b) Each
employee in the sample is given a 5 5?% raise. Find the sample mean
and sample standard deviation for the revised data set. ?(c) To
calculate the monthly? salary,...
Sample annual salaries (in thousands of dollars) for employees at a company are listed. 43, 54,...
Sample annual salaries (in thousands of dollars) for employees
at a company are listed.
43, 54, 55, 51, 33, 33, 43, 54, 55, 26, 51, 43, 46
(a) Find the sample mean and sample standard deviation.
(b) Each employee in the sample is given a $3000 raise. Find
the sample mean and sample standard deviation for the revised data
set.
(c) Each employee in the sample takes a pay cut of $2000 from
their original salary. Find the sample mean...
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