A study investigated whether time perception, an indication of a person's ability to concentrate, is impaired during nicotine withdrawal. Smokers were randomly selected and asked to estimate how much time has passed during a 45-second period, after a 24-hour smoking abstinence. The average perceived elapsed time (in seconds) is 49.3 seconds with a standard deviation of 9.84. Assume that perceived elapsed time follow a normal distribution.

1. Use a hypothesis test to determine if a person's ability to concentrate is impaired during nicotine withdrawal if 15 smokers were included in the experiment. Use a 5% l.o.s. Report the test statistic to 2 decimals correctly
2. Report the critical value
3. You reject the null hypothesis : True/False
4. You conclued that a person's ability to concentrate is impaired during nicotine wihtdrawel. True/False