Mathematics, 24.03.2021 16:50 dustinsampsin9029
Internet company Gurgle is carrying out testing on the efficiency of its search engine. A sample of 31 searches have been carried out and the time taken to display the results has been recorded for each search. The mean search time for the sample was calculated as 0.2258 seconds. The standard deviation of the search times for the sample was calculated as 0.0188 seconds. The population standard deviation of search times is unknown.
1. Select all the techniques that are commonly used to construct a confidence interval for the mean when the population standard deviation (σ) is unknown:
a. Approximate the population standard deviation (σ) with the sample standard deviation (s)
b. Replace the sample size (n) with n-1
c. Decrease the confidence level to compensate for the increased margin of error
d. Approximate the standard normal distribution with the Student's t distribution
2. Calculate the upper and lower bounds of the 95% confidence interval for the mean search time for the Gurgle search engine.
Answers: 2
Mathematics, 21.06.2019 17:00, MrKrinkle77
Igor stravinsky tires sells approximately 3,760,000 car tires and 1,200,000 truck tires each year. about 47,000,000 care tires and 26,000,00 truck tires are sold each year in the united states. what is stravinsky's market share in each of these two markets (cars and trucks)?
Answers: 1
Mathematics, 21.06.2019 18:00, arianaguerin
Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.
Answers: 1
Mathematics, 21.06.2019 23:00, benwill0702
The sum of 5consecutive even numbers is 100. what is the first number in this sequence?
Answers: 1
Internet company Gurgle is carrying out testing on the efficiency of its search engine. A sample of...
Computers and Technology, 05.03.2021 01:40
Mathematics, 05.03.2021 01:40
English, 05.03.2021 01:40
Computers and Technology, 05.03.2021 01:40
Chemistry, 05.03.2021 01:40
Physics, 05.03.2021 01:40