95% confidence interval of a population mean worked out on a sample s..
95% confidence interval of a population mean worked out on a sample size of 10 is, 0.26 < μ < 0.38. What is the likely 95% confidence interval of the mean of the same population worked out on a sample size of 20? => 0.28..
A magazine report stated that the average business traveler will spend..
A magazine report stated that the average business traveler will spend $180 per week on calls. A sample of 20 business travelers are selected at random and their mean expenses was found as $185 with a standard deviation $15. Is there enough evidence to reject the report at α = 0.01...
A report states that the average height of females in the U.S who are ..
A report states that the average height of females in the U.S who are in between 18 and 25 years of age are approximately 64.8 inches. The mean of the height of 10 females in the age group of 18 to 25 years is found as 62.4 inches with a standard deviation of 2.5 inches. Can one reject the report a..
A manual of Medical Information reports that the average weight of a n..
A manual of Medical Information reports that the average weight of a new born baby is 7 pounds. As per the data collected from 14 maternity hospitals, the average weight of a newborn was 7.1 pounds with a standard deviation of 0.2 pounds. Is there enough evidence to reject the report at &..
A retail garment shop receives a shipment of trousers, with a standard..
A retail garment shop receives a shipment of trousers, with a standard length of 49.0 in. and a standard deviation of 1.0 inch. A random sample of 32 trousers had a mean length of 48.8 in. Find the 95% confidence interval. => The interval between 48..
An education department conducted a survey of 400 students on their fa..
An education department conducted a survey of 400 students on their family background. The results revealed that the mean age of adolescent students who belong to high income families was 15.2 years. The standard deviation of the population is observed as 0.6 years. Find the 99% conf..
The formula for the confidence interval for a variance is _________ .
The formula for the confidence interval for a variance is _________ . => IV. or II. or III. or I...
A chocolate manufacturing company reported that milk chocolate bars of..
A chocolate manufacturing company reported that milk chocolate bars of 1.5 to 1.6 ounce have 230 calories on an average. A researcher selected a sample of 100 chocolate bars and found the average as 229.6 calories and a standard deviation of 2.3 calories. Is there enough evidence to reject the manu..
A nutritionist claims that the number of calories in one table spoon o..
A nutritionist claims that the number of calories in one table spoon of the major brands of pancake syrup is 180. A sample of 18 major brands of syrup is selected and found that the mean number of calories in one tablespoon of syrup is 156 with a standard deviation of 54. At α = 0.1..
A cement manufacturer claims that the maximum final setting time of ce..
A cement manufacturer claims that the maximum final setting time of cement is 10 hours. A sample of 13 bags were tested and found that the mean of the maximum final setting time was 11.2 hours with a standard deviation of 1.8 hours. At α = 0.01, can the claim be rejected? Also find ..
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