Statistics
posted by John .
A telephone company's records indicate that private customers pay on average $17.10 per month for longdistance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended for longdistance calls and a sample variance of 45. A 5% significance test is to be performed to determine if the mean level of billing for long distance calls per month is in excess of $17.10. The calculated value of the test statistic and the critical value respectively are:
(2.36, 1.8331)
(1.17, 2.2622)
(2.36, 2.2622)
(1.17, 1.8331)
(0.025, 1.8125)

Statistics 
MathGuru
Remember that standard deviation is the square root of the variance.
Formula:
t = (sample mean  population mean)/(standard deviation divided by the square root of the sample size)
t = (22.10  17.10)/(6.7082/√10)
I'll let you finish the calculation.
The test is onetailed at .05 level of significance. Look at the appropriate table and determine the critical value.
Hint: degrees of freedom = n  1 = 9
Respond to this Question
Similar Questions

MAT 116 – Algebra 1A
A longdistance telephone plan costs $2.00 a month, plus 4 cents per minutes, or part thereof, for any longdistance call made during the month. Write a verbal rule to determine the total monthly cost for your longdistance calls for … 
Math
Global Telephone charges 30 dollars for monthly phone service, plus a long distance calling rate of 15 cents per minute. After an hour of long distance calling charges,the rate drops to just 5 cents per minute for additional long distance … 
Statistics
A telephone company's records indicate that private customers pay on average $17.10 per month for longdistance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended … 
Statistics
A telephone company's records indicate that private customers pay on average $17.10 per month for longdistance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended … 
statistics
A telephone company's records indicate that private customers pay on average $17.10 per month for longdistance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended … 
Math
Two phone companies offer discount rates to students. The first company wants $9.95 per month plus $.10 per minute for long distance calls. The second company wants $12.95 per month plus $.08 per minute for long distance calls. Write … 
Math Help!!
Two phone companies offer discount rates to students. The first company wants $9.95 per month plus $.10 per minute for long distance calls. The second company wants $12.95 per month plus $.08 per minute for long distance calls. Write … 
Math
Student budgeted a $25 a month for phone service. If the telephone company charges $18 a month for basic service and $.05 a minute for each long distance call, how many minutes can be spent on long distance calls each month? 
math
the Ace telephone Co. charges a flat monthly frr of $22.00 for a telephone line and $0.20 per minute for long distance calls. a.if you make 25 minutes of long distance calls per month,what will it cost? 
math
grant pays $0.10 per minute plus $5 per month for telephone long distance write an algebraic expression for m minutes of long distance calls in one month