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1. An amount of R25 000 is invested at an interest rate of 11% per annum compounded half-yearly for n years. Find the value of n if at the end of this period the investment has accumulated to R58 890.
2. R2 000 is invested at 10% per annum compounded half-yearly. After three months, the interest rate changes to 12% per annum compounded monthly. Find the value of the investment after two years.
A sample of n = 25 participants and obtains a t statistic of t = 2.21. Which of the following is the correct decision for a two-tailed test?
If the airline sells 160 tickets for a flight that has only 155 seats, what is probability that a seat will be available for every person holding a reservation and planning to fly?
the weights of a random sample of 49 university male first-year students yielded a mean of 165 pounds and a standard
1.i read an article about a new drug which stated that the incidence of side effects was similar to placebo p-value gt
a survey of 61647 people included questions about office relationships. of the respondents 26 reported that their
1. Let X1,..., Xn be a random sample from a normal population. A particular realization resulted in a sample mean of 20 with the sample standard deviation 4. Construct a 95% con?dence interval for μ when:
the student newspaper called campus press polled a simple random sample of 280 undergraduate students in order to study
A mail order company tracks the number of returns it receives each day. Information for the last 50 days shows
A researcher wishes to estimate within $300 the true average amount of money a country spends on road repairs each year. If she wants to be 90% confident, how large a sample is necessary? The standard deviation is known to be $900.
A fire insurance wants to examine the relationship between the amount of fire damage in major residential fires to the distance between the burning house and the nearest fire station. A sample of 15 recent fires in a particular city was taken.
the expected life of refrigerators produced by the keepitcool company are normally distributed with a mean of 240
A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 35000 miles. To check the claim the firm randomly selects and test 54 of these tires and gets a mean lifetime of 34,570
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