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Computing Appropriate Sample Size Using the Length of the Interval
A. Determine the minimum sample size for each of the following:
a. 95% confidence level, E = 5.8 , "\\sigma" = 40
b. 96% confidence level, E =6, "\\sigma" = 55
c. 99% confidence level, E = 6.5, "\\sigma" = 65
Computing for the Length of the Confidence Interval
Solve the following.
1. A random sample of size 120 has a standard deviation of 25. What is the margin of error
for a 90% confidence level?
2. Compute the length of the confidence interval with a sample size of 220 and with a standard
deviation 60 having an 80% confidence level.
3. The average price of 50 Philippine-made shirts is PIs150 and the population standard
deviation is Pts55. Find the length of the confidence interval of the true average price of the
shirts using a 95% confidence level.
You are planning to buy a cellphone with a good quality in order to attend the online class.
The average price of 50 cellphones is Php13,500 with a margin of error of Php 273.65 and a
confidence level of 99%.
What is the lower limit?
What is the upper limit?
What is the confidence interval?
If you have P13,100.00, is the amount lies within the confidence interval?
An online seller of yema cake, which is very popular in Tayabas Quezon surveyed several
customers. Fifty-two percent (52) of the customers were satisfied with the services that were
offered with a 3.98% margin of error. Determine the confidence interval using this information.
The average percentage of people who are satisfied with the product is_
The lower limit of confidence interval is
The upper limit of confidence interval is
The confidence interval is
The curve of a distribution is?
the mean weight of baggage of 25 passengers from usa bound for the philippines is 31.8 kilos with a variance of 16. test the claim that the population mean baggage weight is equal to 30 kilos at 0.01 level of significance. Assume that the population is normally distributed. The t value is 2.492
A shipment of 12 Apple mobile phones contains 3 defective phones. In how many ways can a store purchase 5 of these phones and receive at least 2 defective phones?
The owner of a factory that sells a particular bottled fruit juice claims the the average capacity of their product is 250 ml to the test claim a consumer group gets a sample of 100 such bottles calculates the capacity of each bottle and then finds the mean capacity to the be 248ml.The standard deviation is 5ml . Test the hypothesis that the population mean is less that 250 ml. Assumed that the population is normally distributed. Use level of significance level is 0.5 and the z value is 1.645
D. Not to
lat the
e is
nsare.
when, in fact, it is
6. A statistics senior high teacher believes that fewer than 20% of QNHS students answered the
online examination through google forms. He surveys 84 of his students and finds that 11 answered
the online exam. An appropriate alternative hypothesis is:
A. p = 0.20
B. p > 0.20
C. p<0.20
D. p < 0.20
When do we add the two corresponding areas of the z-score?
