Assuming that the two groups would have unequal variances

Reference no: EM13624826

A genetics lab wants to alter a species of mosquitoes so that the mean life span becomes shorter. To test whether their effects have been successful, the mean life span of a sample of 40 genetically altered mosquitoes is compared to a sample of 100 unaltered mosquitoes as a control group. The altered mosquitoes had a sample average life span of 17.3 days and a sample standard deviation of 5.4 days. The control group had a sample average life span of 18.8 days with a sample standard deviation of 6.6 days. Assuming that the two groups would have unequal variances, what would be the t-statistic be for the test with the null hypothesis that the means are equal, tested against the alternative hypothesis that the mean for altered mosquitoes is less than the mean of the control group?

-0.668

-1.276

-1.390

-2.213

-3.346

Reference no: EM13624826

Questions Cloud

The speed of sound in air is 343 ms a what is the integer n : a tube is open only at one end. a certain harmonic produced by the tube has a frequency of 715 hz. the next higher

Suppose that a test for hepatitis c is 98 accurate in that : suppose that a test for hepatitis c is 98 accurate in that if a person has hepatitis c the test will indicate positive

A particle of mass m is projected from point a with an : a particle of mass m is projected from point a with an initial velocity v0 perpendicular to line oa and moves under a

The musical notes and corresponding fundamental frequencies : suppose the strings on a violin are stretched with the same tension and each has the same length between its two fixed

Assuming that the two groups would have unequal variances : a genetics lab wants to alter a species of mosquitoes so that the mean life span becomes shorter. to test whether their

Estimate the diameter of the bubble just before it reaches : an air bubble 0.3 in. in diameter is released from the regulator of a scuba diver swimming 100 ft. below the sea sg

Ten percent of the tickets are labeled 25 20 are labeled 15 : morens department store has a special sale whereby each customer upon checkout chooses a random ticket that is labeled

A condenser condenses saturated water vapor at 100 kpa to a : a condenser condenses saturated water vapor at 100 kpa to a saturated liquid. the steam enters at 3 ms and exits at 100

Determine the toal change in alength bcross-sectional : a quantum stabilizer made of cold-worked columbium is 15in long and has a rectangular crosssection 14in by 34in. for a

User Account

All Pages