sample mean

Find the 95% confidence interval for the mean number of people working in night shifts in different parts of the cities in a particular state. A sample of 35 selected cities is shown. => 920.9 < μ < 1,511.4 or 930.905 < μ < 1,501.375 or 925.9 < μ < 1,5..

The 95% confidence interval for the mean number of mangoes in a carton is between 48.12 and 51.88. If a random sample of 27 cartons were used to determine this interval, what was the standard deviation? => 2 or 3 or 4 or 5..

Samples of concrete blocks were tested in a lab to determine the crushing strength of the concrete. The crushing strength of block E was missing from the final records. The sample mean of the crushing strength was recorded as 4.45 tonnes/cm 2 . Find the crushing streng..

A random sample of the daily amount of fuel (in litres) used for running power and heating systems in a manufacturing unit is listed here. Estimate the mean fuel consumption with 90% confidence. => 974.6 < μ < 1233.7 or 1084.8 < μ < 1123.6 or 900 < μ <..

A standard notebook is supposed to have on an average, 200 pages, with a standard deviation of 2 pages. From a supply of 2500 notebooks, a random sample of 40 notebooks was taken and found that the mean number of pages in the notebook was 197. Test at the 0.05 level of confidenc..

A gardener wishes to estimate the number of plants grown in his nursery. The number of plants grown in a 30 sq.feet plot is shown for a sample of 22 different locations in the nursery. Find the mean number of plants per 30 sq.feet grown in the nursery with 95% confidence. => 25 ..

The 95% confidence interval for the mean number of tablets in a bottle of calcium tablets is between 149.04 and 150.96. The standard deviation is 3 tablets. Find the size of the random sample that was used to determine this interval. => 40 or 38 or 6 or 150..

If X = 1 represents a coin landing heads-up, and X = 0 represents a coin landing a coin landing tails-up, then find the sampling distribution of the mean( x ‾ ) for 2 tosses of a fair coin. => Figure 2 or Figure 1 or Figure 3 or Figure 4..

The mean number of candies in a packet is 175, with a standard deviation of 5 candies. A random sample of 70 packets from a certain shipment has a mean of 174.2 candies. Which of the following statements is true? 1.The null hypothesis is accepted. 2.Standard error = 1...

Mediascope Press reports that the teenagers of 13 to 17 years of age spend an average of 4 hours watching television during weekdays. A survey was conducted on a random sample of 20 teenagers of this age group. The mean of watching television of this sample was found t..